According to Vedic system one's life is divided into four parts. That is human program. Suppose one lives for hundred years. It is calculated that a man can live up to a hundred years, although the duration of life is now reducing. So taking into consideration that a man lives for a hundred years, so life is divided into four parts, namely brahmacārī, student life; then gṛhastha, household life; then vānaprastha, retired life; then sannyāsa, renouncement. This is Vedic system.
But Caitanya Mahāprabhu, instead of waiting for the last stage of His life, He took sannyāsa at an early age, only twenty-four years old, when He should have begun the householder life; but He did not do so. For the benefit of the whole human society He renounced His family life and took sannyāsa and extensively traveled all over the tract of land called now India. But He predicted that this missionary activities will be spread in future in as many towns and cities are there on the surface of the globe, and He entrusted Indians, or those who are born in India, He entrusted them, that "Please convey this message throughout the whole world." The exact language, Bengali language:
- bhārata-bhūmite haila manuṣya janma yāra
- janma sārthaka kari' kara para-upakāra
- (CC Adi 9.41)
This means that anyone who has taken birth in India as a human being will kindly make his life successful. And after making his life successful he should distribute this knowledge throughout the whole world for the welfare of the human society. This was His order and prediction.