The Buddha (this saying written down in the 3rd century BCE)
“By oneself is damage done:
by oneself is one defiled.
By oneself is damage not done:
by oneself is one purified.
Purity and impurity come from oneself.
No one can purify another.”
- From The Dhammapada (Verses on the Way, Chapter 12), recorded in the 3rd century BCE. Translation by Glenn Wallis, 2004.