Beauty

For he who would proceed aright in this manner should begin in youth to visit beautiful forms; and first, if he be guided by his instructor aright, to love one such form only – out of that he should create fair thoughts; and soon he will of himself perceive that the beauty of one form is akin to the beauty of another and that beauty in every form is one and the same.

Plato; quoted by Rollo May in The Courage to Create