Bhagavad Gita 10.32

सर्गाणामादीरन्तश्च मध्यं चैवहामर्जुन |
अध्यात्मविद्या विद्यानां वाद: प्रवदतामहम्

Translation

O Arjun, know Me to be the beginning, middle, and end of all creation. Amongst sciences I am the science of spirituality, and in debates I am the logical conclusion.