According to Sri Caitanya Mahaprabhu, this is the way an incarnation should be accepted. Srila Narottama dasa Thakura says, sadhu-sastra-guru-vakya, cittete kariya aikya. One should accept a thing as genuine by studying the words of saintly people, the spiritual master and sastra. The actual center is sastra, the revealed scripture. If a spiritual master does not speak according to revealed scripture, he is not to be accepted. Similarly, if a saintly person does not speak according to the sastra, he is not a saintly person. Sastra is the center for all. Unfortunately, at the present moment, people do not refer to the sastras; therefore they accept rascals as incarnations, and consequently they have made incarnations into a very cheap thing. Intelligent people who follow Sri Caitanya Mahaprabhu's instructions and the instructions of the acarya, the bona fide spiritual master, will not accept a pretender as an incarnation of God. In Kali-yuga, the only incarnation is Sri Caitanya Mahaprabhu. Imitation incarnations take advantage of Sri Caitanya Mahaprabhu. The Lord appeared within the past five hundred years, played as the son of a brahmana from Nadia and introduced the sankirtana movement. Imitating Sri Caitanya Mahaprabhu and ignoring the sastra, rascals present themselves as incarnations and introduce their rascaldom as a religious process. As we have repeatedly said, religion can be given only by the Supreme Personality of Godhead. From the discussions in Caitanya-caritamrta, we can understand that in different ages the Supreme Lord introduces different systems and different religious duties. In this Age of Kali, the only incarnation of Krsna is Sri Caitanya Mahaprabhu, and He introduced the religious duty of Kali-yuga, the chanting of the Hare Krsna maha-mantra: Hare Krsna, Hare Krsna, Krsna Krsna, Hare HareHare Rama, Hare Rama, Rama Rama, Hare Hare.