So far Sentras has graduated 1024 members. Following the Javanese spells, said by Guru Besar and repeated by the graduates, all the graduates licked the hot metal 8 times, the first graduates licked the burning knife 15 times. After that they were given some fruit, among other to test that their tongues were all right. Then, they drank a cup of water, as a sign of absorbing the teaching. All of them, have convincedly followed the ritual, no one hesitated.
Inner power is mysterious but it does exist.
Just like electrical current in the wires, it can not be seen with bare eyes, but it gives power. Supernatural Power Besides inner power, supernatural power could be given to the members. The one who is authorized to give supernatural power in Sentras is the Guru Besar. Sentras has a noble goal, its members could help other people for instance by providing alternative healing, to free someone of being possessed by a spirit. Smooth work in business etc.