If you want to be happy, then you must take to the superior type of religious system which teaches the followers how to love God without any motive, and which is never checked by any material condition. God's name is given here as Adhokṣaja. Adhokṣaja means beyond experimental knowledge. God has got many name according to different situation, and one of the name, for the materialistic person, Adhokṣaja. Akṣaja means experimental knowledge. Akṣa means eyes or senses. Beyond sense perception. So we cannot speculate about God, but we can understand about God from authorities. This is the conception of Bhāgavata-dharma.
So the human life is especially meant for understanding God. That is the version of the Vedānta-sūtra, Vedānta philosophy. The Vedānta philosophy teaches, athāto brahma jijñāsā, "Now this human form of body, which is above the lower grades of forms . . ." There are 8,400,000 forms of body. The soul is transmigrating, evolution. But when we get this human form of body, our main business is to inquire about God. Athāto brahma jijñāsā. Now, if somebody inquires what is God, the immediate reply is, God is the source, original source of everything. Janmādy asya yataḥ (SB 1.1.1). So the human form of life is meant for understanding God, and according to our philosophy, if human body is not utilized for understanding God, then it is misused. If we simply spoil our life like the animals—eating, sleeping, sex life and defending—then the human life is spoiled like animals. The real necessity of human life is to understand God. Not only to understand God superficially, but to understand our eternal relationship with Him, and then prayojana, the ultimate goal of life, is to go back to home, back to Godhead. That is ultimate goal. And if you simply try to understand God as we get it from the revealed scriptures, then after giving up this body, tyaktvā dehaṁ . . . deham means this body. After this death . . . there are many deaths in many bodies, but after this death, tyaktvā dehaṁ punar janma naiti (BG 4.9), he does not enter again into the material body. In his original, spiritual body he goes back to home, back to Godhead.