Should I toggle back & forth between them?
Once a person converts to Christ he is always saved no matter how much he sins.
There's such a thing as false conversion. John the Baptist attacked scribes & Pharisees coming out to hear him. Jesus pointed out people who followed the Gospel for a time and then were choked out by the cares of life or the attractions of something else. (Mt 13)
When anyone hears the word of the kingdom and does not understand it, the evil one comes and snatches away what has been sown in his heart. This is what was sown along the path. 20As for what was sown on rocky ground, this is the one who hears the word and immediately receives it with joy, 21yet he has no root in himself, but endures for a while, and when tribulation or persecution arises on account of the word, immediately he falls away. 22As for what was sown among thorns, this is the one who hears the word, but the cares of the world and the deceitfulness of riches choke the word, and it proves unfruitful. 23As for what was sown on good soil, this is the one who hears the word and understands it. He indeed bears fruit and yields, in one case a hundredfold, in another sixty, and in another thirty." Mt 13:19-23
However -- someone who's actually been changed by the Spirit of God can't but return, repent, and be saved. He's a "
new creature" 2 Cor 5:17. God will seek him out as a child of God (Jn 1:12-13, Mt 18:12). There's no destruction of this relationship.
you do not believe because you are not part of my flock. 27 My sheep hear my voice, and I know them, and they follow me. 28 I give them eternal life, and they will never perish, and no one will snatch them out of my hand.29My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father’s hand. 30 I and the Father are one." John 10:26-30
And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.31What then shall we say to these things? If God is for us, who can be against us? 32 He who did not spare his own Son but gave him up for us all, how will he not also with him graciously give us all things? 33Who shall bring any charge against God’s elect? It is God who justifies. 34 Who is to condemn? Christ Jesus is the one who died—more than that, who was raised— who is at the right hand of God, who indeed is interceding for us. 35Who shall separate us from the love of Christ? Shall tribulation, or distress, or persecution, or famine, or nakedness, or danger, or sword? 36As it is written,
"For your sake we are being killed all the day long;
we are regarded as sheep to be slaughtered." 37No, in all these things we are more than conquerors through him who loved us. 38For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, 39nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord. Rom 8:30-39
Once a person converts to Christ, it is his duty to stop sinning (be an over comer). If he continues in sin then he is not really a Christian.
Whether a person is a Christian or not, it's his duty to stop sinning. The Law demands it, a good God demands it, so I'm unsure the point here. A Christian is not freed from duty ... he's freed from the punishment. His duty becomes much more important due to the significance of how he was freed -- the punishment of Christ, and his union with Christ. (Rom 6).
But continuation in sin is a given for the Christian. He will still accumulate sins. His work in light of his union with Christ is to cease from sins.
If we say we have no sin, we deceive ourselves, and the truth is not in us. 9 If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. 10If we say we have not sinned, we make him a liar, and his word is not in us. 1 My little children, I am writing these things to you so that you may not sin. But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous. 1 John 1:8-2:1
And he will succeed at this, because God is dwelling inside a Christian, and is working in him.
9You, however, are not in the flesh but in the Spirit, if in fact the Spirit of God dwells in you. Anyone who does not have the Spirit of Christ does not belong to him. 10But if Christ is in you, although the body is dead because of sin, the Spirit is life because of righteousness. 11If the Spirit of him who raised Jesus from the dead dwells in you, he who raised Christ Jesus from the dead will also give life to your mortal bodies through his Spirit who dwells in you. Rom 8:9-11
work out your own salvation with fear and trembling, 13for it is God who works in you, both to will and to work for his good pleasure. Pp 2:12-13
Christians thus cease from a particular sin due to the Spirit of God empowering them to stop it. The Spirit of God clearly does not stop every Christian from committing every sin the moment of his conversion. The Spirit of God seems to use sin and cessation from it to teach people by experience; the Spirit also teaches people doctrinally in preparation for these experiences. Therefore the Christian ceases from sins as he grows or changes to the point where the Spirit will empower him. People thus cease from sin given a time of growth and the Spirit of God's empowerment.
