Do not be embarrassed by your mistakes. Nothing can teach us better than our understanding of them. This is one of the best ways of self-education.
A fair day's wages for a fair day's work.
No violent extreme endures.
A man lives by believing something: not by debating and arguing about many things.
A judicious man looks at Statistics, not to "get knowledge, but to save himself from having ignorance foisted 'on him".
Of all the things which man can do or make here below, by far the most momentous, wonderful, and worthy are the things we call books.