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.Civilization advances by extending the number of important operations which we can perform without thinking.Seek simplicity but distrust it.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.Every philosophy is tinged with the coloring of some secret imaginative background, which never emerges explicitly into its train of reasoning.