Common Sense is that which judges the things given to it by other senses.

You should prefer a good scientist without literary abilities than a literate one without scientific skills

Necessity is a guardian in Nature.

Darkness is absence of light. Shadow is diminution of light.

Your brain is much better than you think; just use it!

Affective gestures pointing to things near either in time or space should be made with the hand not very far from the body of the person pointing; and if these things are distant, the hand of the painter should be more extended and the face turned toward the person to whom he is addressing the demonstration.

People of higher talent work, even if they seem to do nothing