Action Periods of tranquillity are seldom prolific of creative achievement. Mankind has to be stirred up. Periods of tranquillity are seldom prolific of creative achievement. Mankind has to be stirred up.YOU MAY ALSO LIKE »Ideas won’t keep, something must be done about them.Familiar things happen, and mankind does not bother about them. It requires a very unusual mind to undertake the analysis of the obvious.The deepest definition of youth is life as yet untouched by tragedy.What is morality in any given time or place? It is what the majority then and there happen to like, and immorality is what they dislike.We think in generalities, but we live in detail.Civilization advances by extending the number of important operations which we can perform without thinking.