Knowledge is gained by one who has faith, who is intent on it and has mastered the senses; and having gained knowledge, that person soon reaches supreme peace.
Explanation
Krishna continues praising knowledge (jñāna) in his teaching to Arjuna. He names three qualities needed to gain it: faith (śraddhā), devotion to the pursuit (tatparaḥ), and restraint of the senses (saṁyatendriyaḥ). The result is supreme peace (śānti), and it comes quickly. Traditions differ on whether "it" in "devoted to it" means the teacher, the knowledge itself, or the Lord.