Śrī Caitanya-caritāmṛta - Madhya-līlā 24.191-192

"“Considering all these points, when one engages in the service of Kṛṣṇa’s lotus feet, Kṛṣṇa gives one the intelligence by which he can gradually progress toward perfection in service to the Lord."

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"“ ‘To those who are constantly devoted to serving Me with love, I give the understanding by which they can come to Me.’"

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Śrī caitanya-caritāmṛta Madhya 24.191 & 192