In the real world in which we live, you always have to choose between evils. And in choosing between evils, you have to have moral criteria for how to make those choices.
The plea of good intentions is not one that can be allowed to have much weight in passing historical judgment upon a man whose wrong-headedness and distorted way of looking at things produced, or helped to produce, such incalculable evil; there is a wide political applicability in the remark attributed to a famous Texan, to the effect that he might, in the end, pardon a man who shot him on purpose, but that he would surely never forgive one who did so accidentally.
When an evil-doer, seeing you practise goodness, comes and maliciously insults you, you should patiently endure it and not feel angry with him, for the evil-doer is insulting himself by trying to insult you.
It is handsomer to remain in the establishment better than the establishment, and conduct that in the best manner, than to make asally against evil by some single improvement, without supporting it by a total regeneration.
Evil had to manifest itself and fulfill its role, so that ultimately Good could prevail. [...] Evil needs to manifest itself, for them to understand the value of Good.
A mind does not receive truth as a chest receives jewels that are put into it, but as the stomach takes up food into the system. It is no longer food, but flesh, and is assimilated. The appetite and the power of digestion measure our right to knowledge. He has it who can use it. As soon as our accumulation overruns our invention or power to use, the evils of intellectual gluttony begin,— congestion of the brain, apoplexy and strangulation.