If you desire to live a sinless selfish life go ahead. I wouldnt. But the fact is sin does not cause you to lose salvation.
Heb 10:26 For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for sins,
Heb 10:27 but a certain fearful expectation of judgment, and fiery indignation which will devour the adversaries.
Heb 6:4 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
Heb 6:5 And have tasted the good word of God, and the powers of the world to come,
Heb 6:6 If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
Heb 6:7 For the earth which drinketh in the rain that cometh oft upon it, and bringeth forth herbs meet for them by whom it is dressed, receiveth blessing from God:
Heb 6:8 But that which beareth thorns and briers is rejected, and is nigh unto cursing; whose end is to be burned.
Luk 6:46 And why call ye me, Lord, Lord, and do not the things which I say?
Mat 7:21 "Not everyone who says to Me, 'Lord, Lord,' shall enter the kingdom of heaven, but he who does the will of My Father in heaven.
Mat 7:22 Many will say to Me in that day, 'Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?'
Mat 7:23 And then I will declare to them, 'I never knew you; depart from Me, you who practice lawlessness!' - NKJV