He who does not understand the supreme certainty of mathematics is wallowing in confusion. — Leonardo da Vinci Copy Share Image
We must doubt the certainty of everything which passes through the senses, but how much more ought we to doubt things contrary… — Leonardo da Vinci Copy Share Image
Those who condemn the supreme certainty of mathematics feed on confusion, and can never silence the contradictions of the sophistical sciences which… — Leonardo da Vinci Copy Share Image
To me it seems that those sciences are vain and full of error which are not born of experience, mother of all… — Leonardo da Vinci Copy Share Image
No human investigation can claim to be scientific if it doesn't pass the test of mathematical proof. — Leonardo da Vinci Copy Share Image
Those who are enamoured of practice without science are like a pilot who goes into a ship without rudder or compass and… — 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
