CC Madhya 16.14-15

yadyapi prabhura ājñā gauḍete rahite
nityānanda-prabhuke prema-bhakti prakāśite
tathāpi calilā mahāprabhure dekhite
nityānandera prema-ceṣṭā ke pāre bujhite
Word for word: 
yadyapi — although; prabhura — of Śrī Caitanya Mahāprabhu; ājñā — the order; gauḍete rahite — to stay in Bengal; nityānanda-prabhuke — unto Nityānanda Prabhu; prema-bhakti — ecstatic love of Godhead; prakāśite — to preach; tathāpi — still; calilā — departed; mahāprabhure — Śrī Caitanya Mahāprabhu; dekhite — to see; nityānandera — of Lord Nityānanda Prabhu; prema-ceṣṭā — the activities of ecstatic love; ke — who; pāre — is able; bujhite — to understand.
Translation: 
Although the Lord told Nityānanda Prabhu to stay in Bengal and spread ecstatic love of God, Nityānanda left to go see Caitanya Mahāprabhu. Who can understand Nityānanda Prabhu’s ecstatic love?