Lord Krṣṇa, seeing the distressful condition of the living entities and forseeing their bleak future, spoke the scripture known as Bhagavad-gītā, which contains unequivocal instructions for mankind. These instructions are like the cooling showers of peace on the blazing forest fire of material existence. Ordinary human activities are quite different from the activities recommended in the Śrīmad Bhagavad-gītā; understanding this difference is essential for us. In our times we find many fruitive workers who claim to be karma-yogīs but in fact are seen to enjoy the fruits of their labor. What is needed is not this false karma-yoga but genuine buddhi-yoga, which Lord Kṛṣṇa several times explains in the Bhagavad-gītā. Buddhi-yoga means "devotion to the Supreme Lord." The Lord says in the Gītā (10.10), "To those who are constantly devoted to serving Me with love, I give the understanding by which they can come to Me." Elsewhere in the Gītā (18.56) the Lord says, "One can understand Me as I am, as the Supreme Personality of Godhead, only by devotional service." Therefore, since buddhi-yoga is the means to attain the Supreme Lord, then buddhi-yoga is nothing other than devotional service. The Supreme Lord is attained through loving devotional service. This fact is well known. Hence the Lord is also known as bhakta-vatsala, "He who is especially inclined toward His devotees."
The course of action one chooses through executing buddhi-yoga is the very means for mankind to attain lasting peace. Such a course of action will enable man to find rest "in the dispensation of providence." We can clearly understand the essence of buddhi-yoga from the Bhagavad-gītā (Chapter 2.39-40):
Thus far I have described this knowledge to you through analytical study. Now listen as I explain it in terms of working without fruitive results. O son of Pṛthā, when you act in such knowledge you can free yourself from the bondage of works. In this endeavor there is no loss or diminution, and a little advancement on this path can protect one from the most dangerous type of fear.
The attainment of peace through the process of sāṅkhya-yoga is for the modern man almost impossible. But peace is easily available through the process of buddhi-yoga, or loving devotional service to the Supreme Lord. And this peace is of the highest nature: it far exceeds the happiness experienced through any other process. Activities that are directly connected to devotional service blossom and develop unhindered by anything external. The amount of devotional activity one performs always remains intact; it is a permanent spiritual gain for the performer, never to be rendered futile. Even a little execution of devotional service is enough to save one from the greatest type of fear.