With a serene mind, free from fear, firm in the vow of brahmacharya, restraining the mind and fixing his thoughts on me, he should sit absorbed in yoga, holding me as the highest goal.
Explanation
Krishna is continuing his instructions to Arjuna on how to sit in meditation. Here he describes the inner state: a calm, fearless mind, disciplined conduct (brahmacarya, often understood as celibacy or more broadly as self-restraint), and attention fixed on Krishna as the goal. Traditions differ on whether "me" means the personal God, Krishna, or the Supreme Self within; the verse allows both readings.