CC Ādi 5.88

ei mata gītāteha punaḥ punaḥ kaya
sarvadā īśvara-tattva acintya-śakti haya
Synonyms: 
ei mata — in this way; gītāteha — in the Bhagavad-gītā; punaḥ punaḥ — again and again; kaya — it is said; sarvadā — always; īśvara-tattva — the truth of the Absolute Truth; acintya-śakti haya — is inconceivable.
Translation: 
Thus the Bhagavad-gītā also states again and again that the Absolute Truth always possesses inconceivable power.