The following is taken from a letter Darwin wrote to Charles Lyell on September 30th, 1861 and for reasons I'm sure you can fathom, I find it comforting in the extreme. Field of flowers growing entirely wrong courtesy of The Illustrated Book of Sayings.
"But I am very poorly today & very stupid & hate everybody & everything. One lives only to make blunders. I am going to write a little Book for Murray on orchids & today I hate them worse than everything so farewell & in a sweet frame of mind, I am.