Hanuman was mischievous in his childhood, and from time to time teased the meditating sages within the forests. Discovering his antics unbearable, but realizing that Hanuman was but a baby, the sages put a delicate curse on him by which he turned not able to recall his have potential https://www.youtube.com/watch?v=6cAOQp6Twlc&t=7s