Spiritual Quiet and Happiness

Happy, then, is the man, of whom it can be said, in the scriptural sense of the terms, he is quiet  in spirit; — a state of mind which can exhibit itself in the most trying situations, and with more effect and beauty perhaps than on other occasions. Smite the quietist on one cheek, and he turns the other. Drive him from his home, and the smile of his cheerful heart lights the walls of a cavern or a dungeon. He returns love for hatred, blessing for cursing. When dying by the hand of his enemies, his language is, "Father, forgive them, for they know not what they do."

"In quietness," says Isaiah, "shall be strength." The quiet man is necessarily victor, — conquering by the force of sentiments which are eternal, and not by the incidents of situation which are perpetually changing. It  is not the body which constitutes the man, but the divine principle at the center. A man is, according to his faith.  And the man, who treads the dungeon or the scaffold, with the acquiescent belief that it is the allotment of Providence, is no prisoner, because he has all the freedom which he asks, and can lose nothing by the death which he himself cheerfully welcomes. He conquers by that power to suffer which is given him through faith. And the power, which renders him victorious, gives him divine peace and happiness.

— edited from A Treatise on Divine Union (1851) Part 8, Chapter 11.