CC Madhya 8.137

īśvaraḥ paramaḥ kṛṣṇaḥ
sac-cid-ānanda-vigrahaḥ
anādir ādir govindaḥ
sarva-kāraṇa-kāraṇam
Synonyms: 
īśvaraḥ — the controller; paramaḥ — supreme; kṛṣṇaḥ — Lord Kṛṣṇa; sat — eternal existence; cit — absolute knowledge; ānanda — absolute bliss; vigrahaḥ — whose form; anādiḥ — without beginning; ādiḥ — the origin of everything; govindaḥ — a name of Lord Kṛṣṇa; sarva — all; kāraṇa — of causes; kāraṇam — He is the original cause.
Translation: 
“ ‘Kṛṣṇa, who is known as Govinda, is the supreme controller. He has an eternal, blissful, spiritual body. He is the origin of all. He has no other origin, for He is the prime cause of all causes.’
Purport: 

This verse is from the Brahma-saṁhitā (5.1).