Kṛṣṇa says that, "After many, many births of struggle, or attempt for acquiring knowledge, when one comes to the solid point of understanding, he understands that vāsudevaḥ sarvam iti (BG 7.19), the origin of everything is Vāsudeva, Kṛṣṇa." Bas. Origin of everything is Kṛṣṇa.
The Vedānta-sūtra says, the first aphorism of Vedānta-sūtra, athāto brahma jijñāsā: "Now this human form of life is meant for inquiring about Brahman." And the Veda says that ahaṁ brahmāsmi: "I am brahma. I am not this body. I am spirit soul." And when one understands that he is spirit soul, brahma-bhūtaḥ prasannātmā (BG 18.54), at once he becomes joyful. That is the sign of brahma-jñāna.
Brahma-bhūtaḥ . . . these are the versions of Bhagavad-gītā. Brahma-bhūtaḥ prasannātmā. As soon as one realizes that "I am brahma. I have nothing to do with this material world," his all anxieties immediately finished. Brahma-bhūtaḥ prasannātmā na śocati na kāṅkṣati. In the Vedānta-sūtra you'll also find, ānandamayo 'bhyāsāt (Vedānta-sūtra 1.1.12). The spirit soul or the Supreme Soul, both of them are ānandamaya. Ānanda means blissful, by nature blissful. Always wants to enjoy. That is the nature of spirit. But at the present moment, because we have forgotten that I am . . . we are spirit soul, part and parcel of the Supreme Lord, mamaivāṁśo jīva-bhūtaḥ (BG 15.7). Identifying ourself with something else, which is transcendent, we are suffering. This is the cause. There are many places.