That is a simple rule, and easy to remember. When I, a thoughtful and unblessed Presbyterian, examine the Koran, I know that beyond any question every Mohammedan is insane; not in all things, but in religious matters.
That is not the best sermon which makes the hearers go away talking to one another and praising the speaker, but which makes them go away thoughtful and serious, and hastening to be alone.
No thoughtful man ever came to the end of his life, and had time and a little space of calm from which to look back upon it, who did not know and acknowledge that it was what he had done unselfishly and for others, and nothing else, that satisfied him in the retrospect, and made him feel that he had played the man.
When a thoughtful human being has overcome incentives to vice and is aware of having done his bitter duty, he finds himself in a state that could be called happiness, a state of contentment and peace of mind in which virtue is its own reward.
What verse is for the poet, dialectical thinking is for the philosopher. He grasps for it in order to get hold of his own enchantment, in order to perpetuate it.