If you control your tongue, then you control your belly, then you control your genital. Rūpa Gosvāmī gives instruction,
- vāco-vegaṁ manaso krodha-vegam
- jihvāvegam udaropastha-vegam
- etān vegān yo viṣaheta dhīraḥ
- sarvām apīmāṁ sa pṛthiviṁ sa śiṣyāt.
- (NOI 1)
This is instruction, that anyone who has become competent to control the tongue, to control the mind, to control the anger, to control the belly and control the genital..., if six kind of control is there, he is fit for becoming spiritual master; he can make disciples all over the world. And if you cannot control your tongue, if you cannot control your anger, control your mental concoction, then how you can become even a spiritual master? That is not possible. Pṛthiviṁ sa śiṣyāt. One who did... That is called gosvāmī, gosvāmī or svāmī, master of the senses. Master of controlling these six kinds.
So beginning is the jihvā. Sevonmukhe hi jihvādau svayam eva sphuraty adaḥ (Brs. 1.2.234). Sevā. The tongue can be engaged in the service of the Lord. How? You chant Hare Kṛṣṇa, always glorify. Vācāṁsi vaikuṇṭha-guṇānuvarṇane. Vācāṁsi, means talking. Talking is the business of tongue, and tasting is the business of tongue. So you engage the tongue in the service of the Lord by glorifying. Whenever... You take a vow that "Whenever I shall speak, I shall simply speak, glorifying Kṛṣṇa, nothing more." That is tongue control. If you don't allow your tongue to speak anything nonsense, grāmya-kathā... We sometimes sit together. We talk so many nonsense. That should be controlled. "Now I have engaged my tongue for the service of the Lord, so we shall not talk anything of sense gratification." This is controlling the tongue. "I cannot eat anything which is not offered to Kṛṣṇa." This is controlling the tongue. So these are small techniques, but it has got great, great value so that Kṛṣṇa will be pleased, the austerity, and He will reveal. You cannot understand. You cannot see Kṛṣṇa. You cannot order Kṛṣṇa, "Kṛṣṇa, please come, dancing with flute. I shall see You." This is order. Kṛṣṇa is not subjected to your order. Therefore Caitanya Mahāprabhu gives us instruction, aśliṣya vā pāda-ratāṁ pinastu māṁ marma-hatāṁ karotu vā adarśanam (CC Antya 20.47). Adarśanam. Everyone wants to see Kṛṣṇa, a devotee, but a pure devotee says that "No, if you don't like to see me, that's all right. You can break my heart. I may always pray to see You. But You do not come and break my heart, that is also accepted. Still, I shall worship You." This is pure devotion. Not that "I have asked Kṛṣṇa to come before me dancing. He did not come. So I give up this nonsense. The Kṛṣṇa consciousness movement is no value." Not like that.