Happiness is not the reward of virtue, but is virtue itself; nor do we delight in happiness because we restrain from our lusts; but on the contrary, because we delight in it, therefore we are able to restrain them. 至福不是德性的酬賞，而是德性本身；我們也並不因為侷限情慾而享有至福；反之，是因為我們享有了至福，我們才能侷限情慾。 - Baruch Spinoza 巴魯赫·斯賓諾莎