"Lessing, who chafed under the sense of various limitations, makes one of his characters say: No one must do anything. A clever pious man said: If a man wills something, he must do it. A third, who was, it is true, an educated man, added: Will follows upon insight. The whole circle of knowledge, will, and necessity was thus believed to have been completed. But, as a rule, a man's knowledge, of whatever kind it may be, determines what he shall do and what he shall leave undone, and so it is that there is no more terrible sight than ignorance in action."