There are two processes. Either you try to become sinless by your efforts, but if you think that you are unable, then you simply surrender to God, and He will help you. He will help you. He says in the Bhagavad-gītā:
- sarva-dharmān parityajya
- mām ekaṁ śaraṇaṁ vraja
- ahaṁ tvāṁ sarva-pāpebhyo
- mokṣayiṣyāmi mā śucaḥ
- (BG 18.66)
One thing is that nobody can understand God if he is sinful. But Kṛṣṇa says, God says that, "You surrender unto Me. I shall help you how to get rid of the resultant action of your sinful life." So to approach God, either you become sinless by your own efforts or you simply surrender unto God, and He will help you to become sinless. Whichever you like. He is giving full freedom.
He is asking that you surrender. He is not forcing. God can force you—He is all-powerful—but He doesn't interfere with your independence. Because we are part and parcel of God—God is fully independent—so we have got also little particle of independence. As soon as we misuse that independence, disobey the words of God, we become sinful.