“All our knowledge has its origin in our perceptions.
Science, its principles and rules.”

“Toutes nos connaissances sont fondées sur nos perceptions.

La science est faite de principes et de règles.”

Léonard De Vinci

 

(extracted from the introduction of his notebooks p1147-1161 – http://goo.gl/RkBjm)

Merci à Guillaume Dumas.