Selfless devotion to Shri Krishna is the only way to purify the heart. So continuously practice devotion until your heart is completely purified. It may take one year, two years, may be one life or even many lifetimes. Guru will not initiate you with the divine mantra until your heart is completely purified. The moment he initiates you with his mantra, you will become free from the bondage of maya, all sufferings will come to an end and you will immediately realise God.
pichla bigara sab govind radhe, guru ki sharan gahi agala bana de
All our births prior to this one have been spoiled. During those lifetimes, our actions, karma were wrong. We performed both good and bad actions and both of these bind the soul in maya. We did not practice devotion, the action that would have freed us from maya. This didn’t happen just once or twice. This human form, which could have enabled us to progress spiritually, was received by us uncountable times. Instead of advancing, our situation became even worse. Why? God has given the greatest power of knowledge to the human form. No other life form has this great asset. As a result, we can understand the philosophy of the Vedas and other scriptures. If we were to give a lecture to an animal, what would people say? “That person has gone fully mad! He’s trying to speak to animals!”
Leaving aside the celestial gods, the human form has the greatest capacity for knowledge. The celestial gods have other greater powers, but they do have the ability to perform new fruit-yielding actions, karma which would enable them to advance spiritually. Instead they are only subject to the consequences of their past actions performed in a human birth. What does this mean?
Let’s say you saved 100,000 rupees in the bank. You stopped depositing money and little by little you started withdrawing it. Every month, without any tension, you took out 10,000 rupees. After 10 months you went to the teller at the bank and he said, “Guard! Remove this man from the bank!” You said, “Wait a minute! You have respectfully been giving me 10,000 rupees every month for the last 10 months.” “Yes, well now your account is empty. What have you come to take? You are wasting my time!” Similarly, someone who enters the celestial abodes only enjoys the consequences of good actions they earned in a human birth. Those consequences eventually come to an end and then he must leave.