Bhagavad Gita 13.30
He who understands that it is only the Law of Nature that brings action to fruition, and that the Self never acts, alone knows the Truth.
प्रकृत्यैव च कर्माणि क्रियमाणानि सर्वशः।यः पश्यति तथाऽऽत्मानमकर्तारं स पश्यति॥prakṛtyaiva ca karmāṇi kriyamāṇāni sarvaśaḥ|yaḥ paśyati tathā''tmānamakartāraṃ sa paśyati||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).