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Man is a being with free will; therefore, each man is potentially good or evil, and it's up to him and only him (through his reasoning mind) to decide which he wants to be.

Ayn Rand (2005). “Atlas Shrugged”, p.9, Penguin
Man is a being with free will; therefore, each man is potentially good or evil, and it's up to him and only him (through his reasoning mind) to decide which he wants to be.