When all think alike, then no one is thinking
Industry is a better horse to ride than genius.
It is easier to develop great power than it is to know how to use it wisely.
The devil is merely a fallen angel, and when God lost Satan he lost one of his best lieutenants.
The genius of a good leader is to leave behind him a situation which common sense, without the grace of genius, can deal with successfully.
The study of error is not only in the highest degree prophylactic, but it serves as a stimulating introduction to the study of truth.