It is folly to shiver over last year's snow.
He who is not aware of his ignorance will be only misled by his knowledge.
The first requisite of style, not only in rhetoric, but in all compositions, is perspicuity.
It is the neglect of timely repair that makes rebuilding necessary.
It is also important to guard against mistaking for good-nature what is properly good-humor,--a cheerful flow of spirits and easy temper not readily annoyed, which is compatible with great selfishness.
The more secure we feel against our liability to any error to which, in fact, we are liable, the greater must be our danger of falling into it.