Can a person live in a lifestyle of sin and still expect to be forgiven?
One of the biggest fallacies that exists today is that "grace" covers all sins. This "grace" being presented is not reconciliation with G-d, but a license to live in open rebellion to His teachings. There is true Grace, and there is false "grace", often referred to as easy grace or "greasy grace".
In 1st Yochanan (John) Chapter 3 we see what true Grace is:
1Jn 3:1 See what love the Father has lavished on us in letting us be called God's children! For that is what we are. The reason the world does not know us is that it has not known him.
1Jn 3:2 Dear friends, we are God's children now; and it has not yet been made clear what we will become. We do know that when he appears, we will be like him; because we will see him as he really is.
1Jn 3:3 And everyone who has this hope in him continues purifying himself, since God is pure.
1Jn 3:4 Everyone who keeps sinning is violating Torah - indeed, sin is violation of Torah.
1Jn 3:5 You know that he appeared in order to take away sins, and that there is no sin in him.
1Jn 3:6 So no one who remains united with him continues sinning; everyone who does continue sinning has neither seen him nor known him.
1Jn 3:7 Children, don't let anyone deceive you - it is the person that keeps on doing what is right who is righteous, just as God is righteous.
1Jn 3:8 The person who keeps on sinning is from the Adversary, because from the very beginning the Adversary has kept on sinning. It was for this very reason that the Son of God appeared, to destroy these doings of the Adversary.
1Jn 3:9 No one who has God as his Father keeps on sinning, because the seed planted by God remains in him. That is, he cannot continue sinning, because he has God as his Father.
1Jn 3:10 Here is how one can distinguish clearly between God's children and those of the Adversary: everyone who does not continue doing what is right is not from God. Likewise, anyone who fails to keep loving his brother is not from God.
As we see above, it is abundently clear, sin is defined as a violation of Torah, both the original commands given at Sinai and the words of Messiah. Anyone who continues to live in sin is not from the Father, nor do they have the Son.
G-d redeemed us at a huge cost, not so we could live in sin and rebellion, but to live in the image of His Son.
Does that mean a person is lost every time they sin? No, we have a High Priest who makes intercession for us continually, even Yeshua the Messiah. What is does mean is that we must confess and repent (turn away from that sin). If we do not, that sin stays on us and defiles us.
A life of continuous sin, to the point where we no longer repent, is a sign that the Ruach (Spirit) has left (or was never there) and that G-d is no longer striving with us to cleanse us. In that case, it is likely the person has been given over to their sin and is not covered by the blood of Messiah. Is that person then capable of being redeemed? Only Adonai can answer that question.
Kefa (Peter) says "work out your salvation with fear and trembling". This does not mean that we are saved by works, but that we need to objectively ascertain are we walking in G-d's light, or are we deceiving ourselves.
Shalom - Rabbi Gavri'el