CC Madhya 8.177
madhya-vayasa, sakhī-skandhe kara-nyāsa
“Śrīmatī Rādhārāṇī’s gopī friends are Her mental activities, which are concentrated on the pastimes of Śrī Kṛṣṇa. She keeps Her hand on the shoulder of a friend, who represents youth.
Rādhārāṇī’s eight companions (aṣṭa-sakhī) are different varieties of pleasure connected with the pastimes of Kṛṣṇa. Following those pastimes of Śrī Kṛṣṇa are other activities, which are represented by the assistants of the gopīs.