CC Ādi 4.83

devī kṛṣṇa-mayī proktā
rādhikā para-devatā
sarva-lakṣmī-mayī sarva-
kāntiḥ sammohinī parā
Word for word: 
devī — who shines brilliantly; kṛṣṇa-mayī — nondifferent from Lord Kṛṣṇa; proktā — called; rādhikā — Śrīmatī Rādhārāṇī; para-devatā — most worshipable; sarva-lakṣmī-mayī — presiding over all the goddesses of fortune; sarva-kāntiḥ — in whom all splendor exists; sammohinī — whose character completely bewilders Lord Kṛṣṇa; parā — the superior energy.
Translation: 
“The transcendental goddess Śrīmatī Rādhārāṇī is the direct counterpart of Lord Śrī Kṛṣṇa. She is the central figure for all the goddesses of fortune. She possesses all the attractiveness to attract the all-attractive Personality of Godhead. She is the primeval internal potency of the Lord.”
Purport: 

This text is from the Bṛhad-gautamīya-tantra.