Principles are things which one calls upon to avoid something unpleasant.
Endeavour-with most diligent labour, O aspiring artist!-to master content. The form will rise to meet you.
One must live with all, e'en if life be hell: Crime makes shame, not monetary stricture.
There is nothing more poetic than the truth. He who does not see poetry in it will always be a poor versifier outside of it.
Two left-handed gloves don't make a pair. Two half-truths don't make a truth.
Seen from the moon we are all the same size.