In the Bhagavad-gītā the last instruction is that, "You surrender to Me." Sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66). So if we surrender to God and if we serve God, because we are part and parcel, then we shall be happy. The energy will come from the central, just like the energy is coming from the heart. Because—this is practical medically and scientifically—the energy is coming. As soon as the heart fails, everything stops. And the energy is there because īśvaraḥ sarva-bhūtānāṁ hṛd-deśe arjuna tiṣṭhati (BG 18.61). Hṛd-deśe, it is there. The īśvara, the Supreme Lord as Paramātmā, is situated within your heart. Now you find out, if you have got means to see. But the situation is given, described in the śāstra.
Therefore yogīs, they try to find out God within the heart. Dhyānāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ (SB 12.13.1). Yogī, those who are yogīs, transcendentalist, they are trying to observe the Supreme Personality of Godhead, dhyānāvasthita, by meditation. That is real meditation, to focus the mind to see the Supreme Personality of Godhead within the heart. But who can see? That is also described in the śāstra. Premāñjana-cchurita-bhakti-vilocanena santaḥ sadaiva hṛdayeṣu (Bs. 5.38), again hṛdayeṣu. Hṛdayeṣu. Premāñjana-cchurita-bhakti-vilocanena santaḥ, santaḥ, saintly person, being developed in Kṛṣṇa consciousness, in love of Kṛṣṇa . . . premāñjana: and smearing the eyes with the ointment of love of Kṛṣṇa. We can see Kṛṣṇa, God, with these eyes when it is anointed with the particular medicine, which is called love of Godhead.
Premāñjana-cchurita-bhakti-vilocanena santaḥ (Bs. 5.38). Not ordinary man; santaḥ, advanced saintly persons. Santaḥ sadaiva paśyanti. Where? Where they see? Hṛdayeṣu: in their own heart. Santaḥ hṛdayeṣu paśyanti. Yaṁ śyāmasundaram acintya-guṇa-svarūpaṁ govindam ādi-puruṣaṁ tam ahaṁ bhajāmi. Yaṁ śyāmasundaram. Kṛṣṇa's another name is Śyāmasundara. He's blackish, but very beautiful. Generally, we don't like to see blackish people. But Kṛṣṇa is so nice. Although He's blackish, He's kandarpa-koṭi-kamanīya. Barhāvataṁsam asitāmbuda-sundarāṅgam. These are described in the Vedic literature. Although He's blackish, He is more beautiful than millions of millions of Cupids. Kandarpa-koṭi-kamanīya.