Fight error with courage and kindness. Look around you and see the injustice that chains so many people. Take time for quiet prayer. Know your faith and let that knowledge burst into flame in your heart. (St. Anthony of Padua)

They say that knowledge born of experience is mechanical, but that knowledge born and consummated in the mind is scientific, while knowledge born of science and culminating in manual work is semi-mechanical. But to me it seems that all sciences are vain and full of errors that are not born of experience, mother of all certainty, and that are not tested by experience, that is to say, that do not at their origin, middle, or end pass through any of the five senses. . . .(Leonardo Da Vinci)

This scene from the 1995 movie starring Ben Kingsley as Moses.