Kṛṣṇa summarizes the internal practice of a devotee. He tells Arjuna to mentally surrender all activities to Him. The word ‘cetasā’ is key—it means this is an internal, meditative shift. While the hands are busy with work, the heart is busy with God. He asks Arjuna to take shelter of ‘buddhi-yoga’ (the yoga of intelligence) and always keep his consciousness fixed on Kṛṣṇa. This is the art of ‘Living in Two Worlds’. Externally, you are a professional, a parent, or a citizen. Internally, you are ‘mat-paraḥ’—one who belongs only to Kṛṣṇa. You use your intelligence to find ways to make your work useful for the Divine. Instead of letting the mind wander into material worries, you consciously guide it back to the Lord. It is a process of ‘continuous mindfulness’. It teaches us that we are the masters of our focus. We cannot always control our external circumstances, but we can control our ‘cetasā’ or our mental offering. By developing the habit of ‘mac-citta’—keeping Kṛṣṇa in the center—our lives become integrated and purposeful. Every act, no matter how small, becomes a link in the chain of yoga.