We are all potentially such sick men. The sanest and best of us are of one clay with lunatics and prison-inmates. And whenever we feel this, such a sense of the vanity of our voluntary career comes over us, that all our morality appears but as a plaster hiding a sore it can never cure, and all our well-doing as the hollowest substitute for that well-being that our lives ought to be grounded in, but alas! are not.
William JamesWhen happiness is actually in possession, the thought of evil can no more acquire the feeling of reality than the thought of good can gain reality when melancholy rules. To the man actively happy, from whatever cause, evil simply cannot then and there be believed in.
William James