Chapter 10 · The Divine Glories · Krishna said
Bhagavad Gita 10.32 — Knowledge of the Self
सर्गाणामादिरन्तश्च मध्यं चैवाहमर्जुन। अध्यात्मविद्या विद्यानां वादः प्रवदतामहम् ॥
sargāṇāmādirantaśca madhyaṃ caivāhamarjuna | adhyātmavidyā vidyānāṃ vādaḥ pravadatāmaham ||
Meaning
Arjuna, I am the beginning, middle and end of all creation. Among kinds of knowledge I am knowledge of the Self, and in discussion I am the honest reasoning that seeks truth.