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Bg 2.68

tasmād yasya mahā-bāho
nigṛhītāni sarvaśaḥ
indriyāṇīndriyārthebhyas
tasya prajñā pratiṣṭhitā
Synonyms: 
tasmāt — therefore; yasya — whose; mahā-bāho — O mighty-armed one; nigṛhītāni — so curbed down; sarvaśaḥ — all around; indriyāṇi — the senses; indriya-arthebhyaḥ — from sense objects; tasya — his; prajñā — intelligence; pratiṣṭhitā — fixed.
Translation: 
Therefore, O mighty-armed, one whose senses are restrained from their objects is certainly of steady intelligence.
Purport: 

One can curb the forces of sense gratification only by means of Kṛṣṇa consciousness, or engaging all the senses in the transcendental loving service of the Lord. As enemies are curbed by superior force, the senses can similarly be curbed, not by any human endeavor, but only by keeping them engaged in the service of the Lord. One who has understood this – that only by Kṛṣṇa consciousness is one really established in intelligence and that one should practice this art under the guidance of a bona fide spiritual master – is called a sādhaka, or a suitable candidate for liberation.