“All men by nature desire to know.”

“It is of the nature of desire not to be satisfied, and most men live only for the gratification of it.”

“All human actions have one or more of these seven causes: chance, nature, compulsion, habit, reason, passion, and desire.”

“Great men are always of a nature originally melancholy.”

“Yes the truth is that men's ambition and their desire to make money are among the most frequent causes of deliberate acts of injustice.”

“In all things of nature there is something of the marvelous.”

“Some men are just as sure of the truth of their opinions as are others of what they know.”