Think before thou speakest. Don Quixote

Nothing in the world is harder than speaking the truth and nothing easier than flattery. If there’s the hundredth part of a false note in speaking the truth, it leads to a discord, and that leads to trouble. But if all, to the last note, is false in flattery, it is just as agreeable, and is heard not without satisfaction. It may be a coarse satisfaction, but still a satisfaction. And however coarse the flattery, at least half will be sure to seem true. That’s so for all stages of development and classes of society. Crime And Punishment

You may fetter my leg, but my will not even Zeus himself can overpower. Discourses

For it is not death or pain that is to be feared, but the fear of pain or death. Discourses