The mind should be completely attached to God, and to ‘God alone’. This is exclusive devotion. Such exclusive devotion purifies the heart.

How do we clean an extremely dirty piece of cloth? We wash it with clean water. With the first wash, only some dirt is removed, if it is extremely dirty. You need to wash it again and again.

In the same way, the mind is full of sins from countless lifetimes. To cleanse it, it will require great efforts. Even Arjun, whom Shri Krishna has personally declared to be the greatest warrior in history, admits this fact.

By Jagadguru Shri Kripalu Ji Maharaj
An excerpt from 'Bhagavad Bhakti' (1st Edition, October 2009)
Page no. 70