Sense gratification means you must have material senses to gratify. So Kṛṣṇa is so pleased, so merciful—not pleased, but He's very merciful—"All right, this rascal wants like this. Give him this facility. All right. This rascal wants to eat stool. All right. Let him have a body of pig." This is going on, nature's law.
So this knowledge, Bhagavad-gītā knowledge, is so perfect for the human society. And Kṛṣṇa wants that this knowledge should be spread because everybody . . . sarva-yoniṣu kaunteya sambhavanti mūrtayaḥ (BG 14.4). He's the seed-giving father. Father is naturally well-wisher, that "These rascals, they are suffering," prakṛti-sthāni. Manaḥ ṣaṣṭhānīndriyāṇi prakṛti-sthāni karṣati (BG 15.7). "Simply by . . . guided by mental speculation, manaḥ, and assisted by the senses, they are struggling so hard. And if they come back to Me they can live so nicely, as My friend, as My lover, as My father, as My mother, Vṛndāvana. So claim again. Call them." That . . . therefore, Kṛṣṇa comes. Yadā yadā hi dharmasya (BG 4.7). Because the whole world is running on under the false impression of sense enjoyment, therefore He comes and advises, sarva-dharmān parityajya (BG 18.66): "You rascal, give up all this engagement. Don't be proud that you are scientifically advanced. You are all rascals. Give up this nonsense. Come to Me. I'll give you protection." This is Kṛṣṇa. How merciful He is. And the same business should be done by Kṛṣṇa's servant. Not to become a great yogī, magic player. No, that is not required. Simply speak what Kṛṣṇa says. Then you become spiritual master. Don't speak anything nonsense.
Caitanya Mahāprabhu also said, yāre dekha tāre kaha 'kṛṣṇa'-upadeśa (CC Madhya 7.128). Simply you preach the instruction of Kṛṣṇa, whomever you meet. Then you become spiritual master. That's all. Very simple thing.