Character is made by many acts; it may be lost by a single one.

Aristotle (384-322 BC) Greek philosopher

(Spurious)

Frequently attributed to Aristotle, but not found in his works. One of the earliest references is in J. A. Haigh, "Character," Great Thoughts from Master Minds (5 Oct 1907). Haigh does not present it as his own thought ("Character, it has been well said, is made up ..."). John Christensen notes that the sentiment of the quote is very non-Aristotelian, feeling more like a Christian teaching about sin than a philosophical commentary. Aristotle generally speaks about developing a habit toward virtue (1, 2, 3), not some sort of all-or-nothing moral imperative.