All feelings that concentrate you and lift you up are pure; only that feeling is impure which grasps just one side of your being and thus distorts you. Everything you can think of as you face your childhood, is good. Everything that makes more of you than you have ever been, even in your best hours, is right. Every intensification is good, if it is in your entire blood, if it isn't intoxication or muddiness, but joy which you can see into, clear to the bottom.

Letter Nine (4 November 1904) - Letters to a Young Poet (1934)