"Gratitude is not only the greatest of virtues, but the parent of all the others."

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I know, indeed, of nothing more subtly satisfying and cheering than a knowledge of the real good will and appreciation of others. Such happiness does not come with money, nor does it flow from fine physical state. It cannot be brought. But it is the keenest joy, after all; and the toiler's truest and best reward.

— William Dean Howells