Emulation is grief arising from seeing one's self, exceeded or excelled by his concurrent, together with hope to equal or exceed him in time to come, by his own ability. But envy is the same grief joined with pleasure conceived in the imagination of some ill-fortune that may befall him.
Thomas HobbesFrom whence it happens, that they which trust to books, do as they that cast up many little sums into a greater, without considering whether those little sums were rightly cast up or not; and at last finding the error visible, and not mistrusting their first grounds, know not which way to clear themselves; but spend time in fluttering over their books, as birds that entering by the chimney, and finding themselves enclosed in a chamber, flutter at the false light of a glass window, for want of wit to consider which way they came in.
Thomas HobbesThe source of every crime, is some defect of the understanding; or some error in reasoning; or some sudden force of the passions. Defect in the understanding is ignorance; in reasoning, erroneous opinion.
Thomas HobbesA man's conscience and his judgment is the same thing; and as the judgment, so also the conscience, may be erroneous.
Thomas Hobbes