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One should forgive one's enemies, but not before they are hanged.
The Romans would never have found time to conquer the world if they had been obliged first to learn Latin.
Where they have burned books, they will end in burning human beings.
Change is certain. Peace is followed by disturbances; departure of evil men by their return.
People are mostly shaped by their genes and their environment, but within those constraints, they have some freedom to choose their own path.
People who learn to control inner experience will be able to determine the quality of their lives, which is as close as any of us can come to being happy.
The defining characteristic of pessimists is that they tend to believe bad events will last a long time, will undermine everything they do, and are their own fault.
Optimists tend to interpret their troubles as transient, controllable, and specific to one situation. Pessimists, on the other hand, believe that their troubles last forever, undermine everything they do, and are uncontrollable.