My trade and art is to live.

To know how to live is my trade and my art.

Don't waste time learning the "tricks of the trade. Instead, learn the trade.

Antigonus, having taken one of his soldiers into a great degree of favor and esteem for his valor, gave his physicians strict charge to cure him of a long and inward disease under which he had a great while languished, and observing that, after his cure, he went much more coldly to work than before, he asked him what had so altered and cowed him: “Yourself, sir,” replied the other, “by having eased me of the pains that made me weary of my life.

Satiety comes of too frequent repetition; and he who will not give himself leisure to be thirsty can never find the true pleasure of drinking

Nothing is so firmly believed as that which is least known