There is no comparison with the devotion of the gopīs. Therefore Kṛṣṇa was always obliged to them. Kṛṣṇa said to the gopīs that "You have to be satisfied with your own business. I cannot return you anything for your love." Kṛṣṇa, the Supreme, the all-powerful, He was unable to repay the debts for the gopīs. Caitanya Mahāprabhu said, ramyā kācid upāsanā vraja-vadhu-vargeṇa yā kalpitā. There is no more better worship than what was conceived by the gopīs. So gopīs are the topmost devotees. And amongst the gopīs, Śrīmatī Rādhārāṇī is the topmost. Therefore Śrīmatī Rādhārāṇī is greater than Kṛṣṇa.