It is ordained that to the ambitious, who derive no satisfaction from the gifts of life and the beauty of the world, life shall be a cause of suffering, and they shall possess neither the profit nor the beauty of the world.
Fire destroys all sophistry, that is deceit; and maintains truth alone, that is gold.
Do not reveal, if liberty is precious to you; my face is the prison of love.
Things that are separate shall be united and acquire such virtue that they will restore to man his lost memory.
Our body is dependent on heaven and heaven on the Spirit.
Why seek to embarrass [the artist] with vanities foreign to his quietness? Know you not that certain sciences require the whole man, leaving no part of him at leisure for your trifles?
Every action needs to be prompted by a motive. To know and to will are two operations of the human mind. Discerning, judging, deliberating are acts of the human mind.
Of the original phenomena, light is the most enthralling.
Just as a well-filled day brings blessed sleep, so a well-employed life brings a blessed death.
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.
Experiment is the sole interpreter of the artifices of Nature.
Just as courage is the danger of life, so is fear its safeguard.
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.
Be eager to lend a patient ear to the opinions of others and think long and hard whether whoever finds fault has reason or not to censure you. And if the answer is yes, correct the fault. If no, give the impression that you have not heard him, or if he is a man whom you respect, explain to him why he is mistaken.
Although human ingenuity may devise various inventions which, by the help of various instruments, answer to one and the same purpose, yet will it never discover any inventions more beautiful, more simple or more practical than those of nature, because in her inventions there is nothing lacking and nothing superfluous; and she makes use of no counterpoise when she constructs the limbs of animals in such a way as to correspond to the motion of their bodies, but she puts into them the soul of the body.
A day will come in which men will look upon an animal's murder the same way they look today upon a man's murder.
One day the world will look upon research upon animals as it now looks upon research on human beings.
The painter must be solitary. For if you are alone you are completely yourself, but if you are accompanied by a single companion, you are only half yourself.
That painter who has no doubts will achieve little.
Old age takes in part savoury wisdom for its food - see to that your old age will not lack in nourishment.
Necessity is the mistress and guide of nature.
I would venture to affirm that a man cannot attain excellence if he satisfy the ignorant and not those of his own craft, and if he be not 'singular' or 'distant,' or whatever you like to call him.
Make yourself a master of perspective, then acquire perfect knowledge of the proportions of men and other animals.
For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
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.
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