Seeming contentment is real discontent, combined with indolence or self-indulgence, which, while taking no legitimate means of raising itself, delights in bringing others down to its own level.
John Stuart MillThe fatal tendency of mankind to leave off thinking about a thing when it is no longer doubtful is the cause of half their errors.
John Stuart MillComplete liberty of contradicting and disproving our opinion, is the very condition which justifies us in assuming its truth for purposes of action.
John Stuart MillThe maxim is, that whatever can be affirmed (or denied) of a class, may be affirmed (or denied) of everything included in the class. This axiom, supposed to be the basis of the syllogistic theory, is termed by logicians the dictum de omni et nullo.
John Stuart Mill