He who does not understand the supreme certainty of mathematics is wallowing in confusion.

Of several bodies, all equally large and equally distant, that which is most brightly illuminated will appear to the eye nearest and largest.

Tears come from the heart and not from the brain

All our knowledge has its origins in our perceptions.

The days are long enough for those who use them.

The painter who has no doubt about his own ability will attain very little.

If you put on more garments, the cold cannot reach you. Similarly, increase your patience and concentration and even great injuries cannot vex your mind.