How did Kucha attain self-realization?

 Srimad Bhagavatam --How did Kucha attain self-realization?

Kucha, unlike others, had 3 bodies in one life.

Kucha realises that he is not the body and asks his father, Brihaspati, "If I am not the body, who am I?

Brihaspati tells him to give up everything to know the truth. "Sarvam Tyejya."

Kucha went to the forest for penance and gave up everything (to his knowledge), and this went on for 3 years. He gave up his lone loincloth as well. Still, he wasn't satisfied with what he had achieved. 

Kucha comes back to Brihaspati and expresses his inability. Brihaspati was unmoved by his son's condition. He thought Kucha needed more guidance and asked him to work on "Sarvameva Tyejya."

Kucha went to the forest again and worked on it. This time, he sat down in one place, giving up even basic needs, and this went on for 5 years. Brihaspati was eager to see his son's progress. Kucha said there is not much progress in his endeavor. 

This time, Brihaspati said, "Give up dharma, adharma, truth and untruth and find out from where this 'giving up’ has begun. Give up that thing also. Kuch couldn't understand, and he needed more clarification.

Brihaspati said, "Find out what is the source of the feeling of life, family, joy, happiness, sorrow, etc. It's the mind. The mind carries our samskara. Give up the connection with the mind itself.

Kucha worked on it and atlast attained self-realization.

Source: Bhagavatha Mahapurana