"I have often heard it said that gratitude is not to be found. That is not true—those who say so have always looked in the mistaken place. One who truly benefits another is for that moment at a level with the Pancreator, and in gratitude for that elevation will serve the other all his days."
January 1, 1970
https://en.wikiquote.org/wiki/The_Book_of_the_New_Sun