Definition of Krishna given by Lord Brahma

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Isvarah paramah krsnah sac-cid-ananda-vigrahah anadir adir govindah sarva-karana-karanam [Bs. 5.1]

Krishna who is known as Govinda is the Supreme Godhead. He has an eternal blissful spiritual body. He is the origin of all. He has no other origin and He is the prime cause of all causes.

Srila Prabhupada, Durban, October 9, 1975: This is the definition of Krishna given by Lord Brahma in his book known as Brahma-samhita, very authorized book. This book was collected by Sri Caitanya Mahaprabhu from southern India, and He presented it to His devotees when He came back from southern India tour. Therefore we accept this book, Brahma-samhita, as very authoritative. This is our process of knowledge. We receive knowledge from the authority. Everyone receives knowledge from the authority, but general authority, and our process of accepting authority is little different. Our process of accepting one authority means he is also accepting his previous authority. One cannot be authority self-made. That is not possible. Then it is imperfect.”

Bhagavad-gita 7.1
by His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Durban, October 9, 1975