Kṛṣṇa says, mat-sthāni sarva-bhūtāni nāhaṁ teṣu avasthitaḥ (BG 9.4): "Everything is resting on Me, but still, it appears that I am not there." This is illusory energy. Vāsudevaḥ sarvam iti (BG 7.19), that's a fact. Vāsudeva is everywhere. Kṛṣṇa is everywhere. Simply we have to purify our senses to understand the presence of Vāsudeva. That is required. And that is possible if we increase our loving tendency to love Kṛṣṇa. Premāñjana-cchurita-bhakti-vilocanena santaḥ sadaiva hṛdayeṣu vilokayanti (Bs. 5.38). If we increase our loving propensity. . . That is already there, but now it is intervened by the māyā cloud. So we have to get out of the cloud. Then we will find vāsudevaḥ sarvam iti sa mahātmā sudurlabhaḥ (BG 7.19). So that is called purificatory process.
So this purificatory process means this devotional service. Sevonmukhe hi jihvādau svayam eva sphuraty adaḥ (CC Madhya 17.136). Vāsudeva reveals. You cannot. . . By your force, you cannot see Him. But He is pleased, sevonmukhe hi jihvādau, when you accept to serve Him by your tongue, beginning with tongue, kīrtanam. You glorify Kṛṣṇa. You taste Kṛṣṇa's prasādam with devotion and service. Then you realize Vāsudeva very easily. Ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ (CC Madhya 17.136). These blunt senses, they cannot realize. But when the senses are purified, hṛṣīkeṇa hṛṣīkeśa-sevanaṁ bhaktir ucyate (CC Madhya 19.170). So this Kṛṣṇa consciousness movement is the process by which you can purify, sanctify your senses. And then, when your senses are engaged in Kṛṣṇa's service, beginning with the tongue, then your life becomes perfect.