“By oneself is evil done, by oneself is one defiled. By oneself is evil left undone, by oneself is one purified. Purity and impurity depend on oneself; no one can purify another.”
Canonical Pali Original: Attanā va kataṃ pāpaṃ, attanā saṅkilissati; Attanā akataṃ pāpaṃ, attanāva visujjhati; Suddhī asuddhī paccattaṃ, nāññamañño visodhaye.
— Gautam Buddha
The Awakened One, Founder of Dhamma
Pali Canon: Dhammapada 12.165, the foundational principle of ethical autonomy and personal karmic accountability.