Thou, O God, dost sell us all good things at the price of labour. - Leonardo da Vinci

I abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils

Whenever you make a figure of a man or of some graceful animal remember to avoid making it seem wooden; that is it should move with counterpoise and balance in such a way as not to seem a block of wood.

I love those who can smile in trouble, who can gather strength from distress, and grow brave by reflection. 'Tis the business of little minds to shrink, but they whose heart is firm, and whose conscience approves their conduct, will pursue their principles unto death