The noblest pleasure is the joy of understanding.
Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity.
I love those who can smile in trouble, who can gather strength from distress, and grow brave by reflection. 'Tis the business of little minds to shrink, but they whose heart is firm, and whose conscience approves their conduct, will pursue their principles unto death.
Tears come from the heart and not from the brain.
Learning never exhausts the mind.
A beautiful body perishes, but a work of art dies not.
Poor is the pupil who does not surpass his master.
There are three classes of people: those who see, those who see when they are shown, those who do not see.
Art is never finished, only abandoned.
The greatest deception men suffer is from their own opinions.
I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.
Nothing strengthens authority so much as silence.
Time abides long enough for those who make use of it.
Why does the eye see a thing more clearly in dreams than the imagination when awake?
The human foot is a masterpiece of engineering and a work of art.
Water is the driving force of all nature.
Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.
Blinding ignorance does mislead us. O! Wretched mortals, open your eyes!
As a well-spent day brings happy sleep, so a life well spent brings happy death.
While I thought that I was learning how to live, I have been learning how to die.
In rivers, the water that you touch is the last of what has passed and the first of that which comes; so with present time.
Our life is made by the death of others.
Time stays long enough for anyone who will use it.
Who sows virtue reaps honor.
He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.
You can have no dominion greater or less than that over yourself.
It's easier to resist at the beginning than at the end.
Where there is shouting, there is no true knowledge.
The smallest feline is a masterpiece.
The beginnings and ends of shadow lie between the light and darkness and may be infinitely diminished and infinitely increased. Shadow is the means by which bodies display their form. The forms of bodies could not be understood in detail but for shadow.
Just as courage imperils life, fear protects it.
I have offended God and mankind because my work didn't reach the quality it should have.
Marriage is like putting your hand into a bag of snakes in the hope of pulling out an eel.
The natural desire of good men is knowledge.
It is better to imitate ancient than modern work.
The human bird shall take his first flight, filling the world with amazement, all writings with his fame, and bringing eternal glory to the nest whence he sprang.
All our knowledge has its origins in our perceptions.
Nature never breaks her own laws.
Where the spirit does not work with the hand, there is no art.
Life well spent is long.
Although nature commences with reason and ends in experience it is necessary for us to do the opposite, that is to commence with experience and from this to proceed to investigate the reason.
Men of lofty genius when they are doing the least work are most active.
The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.
Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.
You do ill if you praise, but worse if you censure, what you do not understand.
Beyond a doubt truth bears the same relation to falsehood as light to darkness.
Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking, and nothing is superfluous.
Medicine is the restoration of discordant elements; sickness is the discord of the elements infused into the living body.
He who is fixed to a star does not change his mind.
Painting is concerned with all the 10 attributes of sight; which are: Darkness, Light, Solidity and Colour, Form and Position, Distance and Propinquity, Motion and Rest.
Common Sense is that which judges the things given to it by other senses.
Knowledge of the past and of the places of the earth is the ornament and food of the mind of man.
I have always felt it is my destiny to build a machine that would allow man to fly.
The painter who draws merely by practice and by eye, without any reason, is like a mirror which copies every thing placed in front of it without being conscious of their existence.
In order to arrive at knowledge of the motions of birds in the air, it is first necessary to acquire knowledge of the winds, which we will prove by the motions of water in itself, and this knowledge will be a step enabling us to arrive at the knowledge of beings that fly between the air and the wind.
As every divided kingdom falls, so every mind divided between many studies confounds and saps itself.
Science is the captain, and practice the soldiers.
He who wishes to be rich in a day will be hanged in a year.
There are four Powers: memory and intellect, desire and covetousness. The two first are mental and the others sensual. The three senses: sight, hearing and smell cannot well be prevented; touch and taste not at all.
The poet ranks far below the painter in the representation of visible things, and far below the musician in that of invisible things.
Experience does not err. Only your judgments err by expecting from her what is not in her power.
The length of a man's outspread arms is equal to his height.
Necessity is the mistress and guide of nature. Necessity is the theme and inventress of nature, her curb and her eternal law.
The senses are of the earth, the reason stands apart from them in contemplation.
The truth of things is the chief nutriment of superior intellects.
I have wasted my hours.
Intellectual passion drives out sensuality.
Men of lofty genius sometimes accomplish the most when they work least, for their minds are occupied with their ideas and the perfection of their conceptions, to which they afterwards give form.
To such an extent does nature delight and abound in variety that among her trees there is not one plant to be found which is exactly like another; and not only among the plants, but among the boughs, the leaves and the fruits, you will not find one which is exactly similar to another.
Every action needs to be prompted by a motive.
Experience never errs; it is only your judgments that err by promising themselves effects such as are not caused by your experiments.
There is no object so large but that at a great distance from the eye it does not appear smaller than a smaller object near.
Just as courage is the danger of life, so is fear its safeguard.
Just as food eaten without appetite is a tedious nourishment, so does study without zeal damage the memory by not assimilating what it absorbs.
The divisions of Perspective are 3, as used in drawing; of these, the first includes the diminution in size of opaque objects; the second treats of the diminution and loss of outline in such opaque objects; the third, of the diminution and loss of colour at long distances.
Many are they who have a taste and love for drawing, but no talent; and this will be discernible in boys who are not diligent and never finish their drawings with shading.
People talk to people who perceive nothing, who have open eyes and see nothing; they shall talk to them and receive no answer; they shall adore those who have ears and hear nothing; they shall burn lamps for those who do not see.
I have found that, in the composition of the human body as compared with the bodies of animals, the organs of sense are duller and coarser. Thus, it is composed of less ingenious instruments, and of spaces less capacious for receiving the faculties of sense.
The mind of the painter must resemble a mirror, which always takes the colour of the object it reflects and is completely occupied by the images of as many objects as are in front of it.
How many emperors and how many princes have lived and died and no record of them remains, and they only sought to gain dominions and riches in order that their fame might be ever-lasting.
Each man is always in the middle of the surface of the earth and under the zenith of his own hemisphere, and over the centre of the earth.
Weight, force and casual impulse, together with resistance, are the four external powers in which all the visible actions of mortals have their being and their end.
It seems that it had been destined before that I should occupy myself so thoroughly with the vulture, for it comes to my mind as a very early memory, when I was still in the cradle, a vulture came down to me, he opened my mouth with his tail and struck me a few times with his tail against my lips.
The spirit desires to remain with its body, because, without the organic instruments of that body, it can neither act, nor feel anything.
The Medici created and destroyed me.
Good men by nature, wish to know. I know that many will call this useless work... men who desire nothing but material riches and are absolutely devoid of that of wisdom, which is the food and only true riches of the mind.
Our body is dependant on Heaven and Heaven on the Spirit.
All knowledge which ends in words will die as quickly as it came to life, with the exception of the written word: which is its mechanical part.
For, verily, great love springs from great knowledge of the beloved object, and if you little know it, you will be able to love it only little or not at all.
The painter who is familiar with the nature of the sinews, muscles, and tendons, will know very well, in giving movement to a limb, how many and which sinews cause it; and which muscle, by swelling, causes the contraction of that sinew; and which sinews, expanded into the thinnest cartilage, surround and support the said muscle.
Man and animals are in reality vehicles and conduits of food, tombs of animals, hostels of Death, coverings that consume, deriving life by the death of others.