CC Madhya 24.191

vicāra kariyā yabe bhaje kṛṣṇa-pāya
sei buddhi dena tāṅre, yāte kṛṣṇa pāya
Word for word: 
vicāra — consideration; kariyā — doing; yabe — when; bhaje — one worships; kṛṣṇa-pāya — at the lotus feet of Kṛṣṇa; sei buddhi — that intelligence; dena — gives; tāṅre — to him; yāte — by which; kṛṣṇa pāya — one gets the shelter of the lotus feet of Kṛṣṇa.
Translation: 
“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.