Below is the transcription of a lecture Srila Prabhupada gave on September 18, 1969 in London, on the occasion of the appearance anniversary of Srimati Radharani.
Prabhupāda: (chants maṅgalācaraṇa prayers) Today is birth, appearance day of Śrīmatī Rādhārāṇī, Rādhāṣṭamī. Fifteen days after Kṛṣṇa’s birth, Rādhārāṇī appeared. (pause) Rādhārāṇī is Kṛṣṇa’s pleasure potency. Rādhā-kṛṣṇa-praṇaya-vikṛtir hlādinī-śaktiḥ.
The Lord, the Supreme Personality of Godhead, has got varieties of energies, as it