“Be yourself, but always your better self.”
Sentence-Sermons from Brigham Young University Quarterly quoted in The Latter-Day Saints' Millenial Star, Vol. 70 https://books.google.com/books?id=eItJAAAAYAAJ&pg=PA452&lpg=PA452&dq=He+that+cheats+another+is+a+knave;+but+he+that+cheats+himself+is+a+fool.&source=bl&ots=WBAQiPjQX6&sig=WLEdKN2_kXPXj8jZALKCp2dguaQ&hl=en&sa=X&ved=0ahUKEwjXmNeF_7HMAhUH42MKHdySDgsQ6AEILzAE#v=onepage&q=fool&f=false
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Karl G. Maeser 12
prominent Utah educator and a member of The Church of Jesus… 1828–1901Related quotes

“Better to write for yourself and have no public, than to write for the public and have no self.”
The New Statesman (1933-02-25)

Paris Review interview (1958)
Context: Always dream and shoot higher than you know you can do. Don't bother just to be better than your contemporaries or predecessors. Try to be better than yourself. An artist is a creature driven by demons. He don’t know why they choose him and he’s usually too busy to wonder why. He is completely amoral in that he will rob, borrow, beg, or steal from anybody and everybody to get the work done.

Kant, Immanuel (1996), page 95
Anthropology from a Pragmatic Point of View (1798)

“The call to religion is not a call to be better than your fellows, but to be better than yourself.”
Source: Life Thoughts (1858), p. 18