No known source; it appears to be a paraphrase of the last sentence of Einstein's "An Ideal of Service to Our Fellow Man". Earliest known attribution is in the Washington Afro-American, AFRO Magazine Section, September 21, 1954, p. 2
More quotes by Albert Einstein
A happy man is too satisfied with the present to dwell too much on the future.
Try to become not a man of success, but try rather to become a man of value.
Life is like riding a bicycle. To keep your balance you must keep moving.
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Attribution
Quote text and notes from Wikiquote: Albert Einstein (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.