Humour is the only test of gravity, and gravity of humour, for a subject which will not bear raillery is suspicious, and a jest which will not bear serious examination is false wit.
A foolish consistency is the hobgoblin of little minds, adored by little statesmen and philosophers and divines. With consistency a great soul has simply nothing to do. He may as well concern himself with his shadow on the wall. Speak what you think now in hard words and tomorrow speak what tomorrow thinks in hard words again, though it contradict everything you said today.