Whoever in debate quotes authority uses not intellect, but memory. — Leonardo da Vinci Copy Share Image
There are four Powers: memory and intellect, desire and covetousness. The two first are mental and the others sensual. The three senses:… — Leonardo da Vinci Copy Share Image
He who in reasoning cites authority is making use of his memory rather than of his intellect. — Leonardo da Vinci Copy Share Image
Just as iron rusts from disuse, even so does inaction spoil the intellect. — Leonardo da Vinci Copy Share Image
Just as iron rusts from disuse, and stagnant water putrefies, or when cold turns to ice, so our intellect wastes unless it… — Leonardo da Vinci Copy Share Image
The acquisition of knowledge is always of use to the intellect, because it may thus drive out useless things and retain the… — Leonardo da Vinci Copy Share Image
There is no doubt that truth is to falsehood as light is to darkness; and so excellent a thing is truth that… — Leonardo da Vinci Copy Share Image
The evil which does me no harm is like the good which in no wise avails me. — Leonardo da Vinci Copy Share Image
A painter should begin every canvas with a wash of black, because all things in nature are dark except where exposed by the light. — Leonardo da Vinci Copy Share Image
An arch consists of two weaknesses which, leaning one against the other, make a strength. — Leonardo da Vinci Copy Share Image
But to me all sciences seem vain and full of error that are not born of experience, mother of all certainty, and do not… — Leonardo da Vinci Copy Share Image
It is ordained that to the ambitious, who derive no satisfaction from the gifts of life and the beauty of the world, life shall… — Leonardo da Vinci Copy Share Image
Be a mirror, absorb everything around you and still remain the same — Leonardo da Vinci Copy Share Image
Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking,… — Leonardo da Vinci Copy Share Image
People reveal themselves completely only when they are thrown out of the customary conditions of their life. — Leonardo da Vinci Copy Share Image
