In the fourth book, I showed that the inclination for the good in general is the cause of the restlessness of the will; that restlessness of the will puts the mind in a state of continual agitation, and that an incessantly agitated mind is utterly incapable of discovering slightly obscure truths; that the love of new and extraordinary things often prejudices us in their favor, and that everything that bears the mark of the infinite is capable of dazzling our imagination and beguiling us.