"Your expression that "it appears as if God would only pour his blessings into pure vessels," pleases me exceedingly. If a man be without this blessing, he cannot charm it towards him. I agree with you in thinking that this blessing is given to man in a mysterious way which we cannot see. But the ideas attached to the words happiness and unhappiness are of so vague and undetermined a nature, even in the minds of those who usually entertain correct views and opinions, that I have from early youth endeavoured to get clear conceptions upon this subject ; and the conclusion at which I have arrived is, that man is ever sure to enjoy a certain amount of happiness at least, if he render himself independent of external circumstances — if he learn to draw happiness from every event of a pleasing nature, whether relating to man or things, at the same time maintaining his independence of both sources."
January 1, 1970
https://en.wikiquote.org/wiki/Wilhelm_von_Humboldt