Guru's Intention is to Destroy the Ego

Mata Amritanandamayi (Amma):

“A true guru will not allow an iota of ego to grow in the disciple. To check the growth of pride, the guru may act in a very cruel manner. People who see the blacksmith forging a hot piece of iron with his hammer may think that he is a cruel person. The iron piece may also think that nowhere can there be such a brute. But while dealing each blow, the blacksmith is only thinking of the end product. The real guru is also like this”. 

https://www.youtube.com/watch?v=tTx7XG2WTlA