Sri Chinmoy: It has very little to do with true Yoga. Yoga means “union with God.” If somebody does miracles, he is not helping you directly or indirectly to realise God. At most we learn from him that there is no end to human capacity. If one enters into the secret domains where the inherent powers of the cosmic realities exist, one can get the capacity to do anything.
I know an amusing incident in connection with a fakir in India who used to perform this very feat you mention. He could remain buried for long periods of time and often lay underground for as long as twenty-one days. Once it happened that when he was dug up from his long burial, the moment he regained consciousness, he looked around frantically for his girlfriend who was standing amidst his relatives, friends and admirers. Having found his paramour, he left the spot immediately with her.
Now did his unusual achievement help the audience in any way in their aspiration for God-realisation? You tell me. By performing these miracles, we in no way inspire others to unite themselves with God, whereas in helping someone in his aspiration, his concentration and his meditation, we do help the person to realise God.