Living in sin ( 1 John 1 v 5 v 10 )

Michael Wilcock writes,  '' Never in Life can the Lord's servant claim immunity from Satan's attacks on a heart which is not yet sinless and a body which is still mortal''.I often pray and ask God why some unclean thought comes into my mind?,why are my thoughts not always pure, and I have to raise a prayer and ask God to create in me a clean heart.In Romans 7 we read of the godly apostle  Pauls concern for that law of sin which is within him and indeed in every believer.In Galatians 5 v 16 ff  he writes of the sinful nature which besets him, and every believer, he stresses the different aspects of that fallen nature,'' sexual immorality,impurity and debauchery, idolatry and witchcraft,hatred , discord,jealousy, fits of rage,selfish ambition,dissensions,factions,and envy,; drunkenness,orgies, and the like''Then he gives a solemn warning,''that those who live like this will not inherit the kingdom of God''.Now he is not writing about the normal Christian life,where we may be tempted and even as David  did and fall into sin,I believe that one of  the evidence that we are a  Christian is we do not live in sin.As John writes in 1 John 5 v 18 ,''Anyone born of God does not continue in sin''John Stott  writes the following on these words, ''The new birth results in new behaviour. Sin and the child of God are incompatible. They may occasionally meet; they cannot live together in harmony''