When you act according to the direction of the Supreme, Kṛṣṇa, or His representative, that is called buddhi-yoga. That is real... Buddhi means intelligence, and yoga means linking, connecting. In the Tenth Chapter you'll find,
- teṣāṁ satata-yuktānāṁ
- bhajatāṁ prīti-pūrvakam
- dadāmi buddhi-yogaṁ taṁ
- yena mām upayānti te
- (BG 10.10)
There is the buddhi-yoga, one word, and here is also the buddhi-yoga. So what is that buddhi-yoga? Kṛṣṇa says, teṣāṁ satata-yuktānām: "Persons who are twenty-four hours engaged," satata... Satata means always. Engaged. What kind of engagement? Bhajatāṁ prīti-pūrvakam. This engagement means always trying to render some service to the Lord. How? Prīti-pūrvakam: "with love and faith." Not that "Oh, I have to do it? All right, let me do." No. "Oh, I have to do it? Let me do it nicely." Unless there is love, you cannot do it nicely, any matter.