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CC Ādi 4.118

harir eṣa na ced avātariṣyan
mathurāyāṁ madhurākṣi rādhikā ca
abhaviṣyad iyaṁ vṛthā visṛṣṭir
makarāṅkas tu viśeṣatas tadātra
Synonyms: 
hariḥ — Lord Kṛṣṇa; eṣaḥ — this; na — not; cet — if; avātariṣyat — would have descended; mathurāyām — in Mathurā; madhura-akṣi — O lovely-eyed one (Paurṇamāsī); rādhikā — Śrīmatī Rādhikā; ca — and; abhaviṣyat — would have been; iyam — this; vṛthā — useless; visṛṣṭiḥ — the whole creation; makara-aṅkaḥ — the demigod of love, Cupid; tu — then; viśeṣataḥ — above all; tadā — then; atra — in this.
Translation: 
“O Paurṇamāsī, if Lord Hari had not descended in Mathurā with Śrīmatī Rādhārāṇī, this entire creation — and especially Cupid, the demigod of love — would have been useless.”
Purport: 

This verse is spoken by Śrī Vṛndā-devī in the Vidagdha-mādhava (7.3) of Śrīla Rūpa Gosvāmī.