Durvāsā Muni, he was so perfect yogī that within one year he traveled all over this material space and beyond the material space in the spiritual space, that went directly to the kingdom of . . . abode of God, Vaikuṇṭha, and saw the Personality of Godhead personally. Still, he was so weak that he has to come back and fall down on the feet of Mahārāja Ambarīṣa. But Mahārāja Ambarīṣa, he was ordinary king, he was simply thinking of Kṛṣṇa. That's all. These instances we'll see.
Therefore the highest perfectional yoga system is to control the mind. And you can control the mind very easily if you keep the lotus two feet of Kṛṣṇa within you, that's all. Simply think of Kṛṣṇa, and you are conqueror; you are victorious. You become the topmost yogī . . . because after all, the yoga system is yoga indriya saṁyama (BG 4.27).
Yoga means to control the senses. And above the sense, the mind. So if you control the mind, the senses are controlled automatically. Your tongue wants to eat something nonsense, but if your mind is strong, mind says: "No. You cannot eat. You cannot eat anything except kṛṣṇa-prasāda," then tongue is controlled.
So senses are controlled by the mind. Indriyāṇi parāṇy āhur indriyebhyaḥ paraṁ manaḥ (BG 3.42).
My body means senses, so the senses . . . my activities means sensual activities, that's all. But above the senses is the mind. Above the mind is the intelligence. And above the intelligence is the spirit soul. If one is on the spiritual platform, on the soul platform, then his intelligence is spiritualized, his mind is spiritualized, his senses are spiritualized, he is spiritualized. This is the process of Kṛṣṇa consciousness.
Because actually the spirit soul is working, but he has given his power of attorney to this nonsense mind. He is sleeping. But when he's awakened—the master is awakened—the servant cannot do anything nonsense. Similarly, if you are awakened in Kṛṣṇa consciousness, your intelligence, your mind or your senses cannot act nonsensically. They must according to that. That is spiritualization. That is called, purification. Hṛṣīkeṇa hṛṣīkeśa-sevanaṁ bhaktir ucyate (CC Madhya 19.170).
Bhakti means to act spiritually. How you can act? You have to act with your senses. Therefore you have to spiritualize your senses. Meditation . . . stopping action means stopping nonsense. But acting in Kṛṣṇa consciousness is transcendental. Just like you have to stop your senses acting nonsense; but that is not perfection.
You have to act nicely. Then it is perfection. Otherwise, if you don't train your senses to act nicely, it will again fall down to the nonsense activities. So we have to give engagement to the senses to act for Kṛṣṇa. Then there is no chance of falldown. That is Kṛṣṇa consciousness.