Why should we avoid sin

Should we avoid wrongdoing? Yes, and no. No!?

As God's child, we are not to avoid harmful behavior (sin) because of guilt, shame, threat of judgment, or fear of punishment. Why? Because Christ ¹already addressed these fully and perfectly!

Also, note, that in those situations, the focus of guilt and shame is usually not about others but ourselves, i.e. my guilt and my shame, etc. It isn't on how I am hurting others, but on how guilt and shame affect me.

Then why should we avoid wrongdoing?

Because it's incredibly harmful and destructive to others, not just ourselves. (This is primarily about others, not just us - God first and loving our neighbor as we love ourselves). 

Harmful (wrong) behavior cuts us off from the source of our spiritual and emotional development, violates our design, and prevents us from reaching our greatest potential, thereby dishonoring our Creator and Designer, others, as well as ourselves.

It would be equivalent to a child growing up severely malnourished, resulting in them wearing leg braces or needing a special needs education when genetically he or she had the initial capacity of being an Olympian or great inventor.

Wrong, harmful behavior (sin) no longer matters when it comes to our good standing - legal status - before God or his perfect and total acceptance of us but it matters dramatically when it comes to our being all we were created to be for God and our neighbor.

And because it no longer affects our good standing (legal status) before God, this frees us to focus on being all God designed us to be out of love for and trust in Him. Understanding this is absolutely essential to living for God as He intends us to - out of love and trust, not guilt and shame.

God's total acceptance, love and embrace of us - because of Christ's efforts - is the spiritual and emotional nourishment we need and must have to thrive, flourish, and be all God designed us to be.

This is the essence of Paul's words in Rome 8:1-4:

"There is therefore now no condemnation for those who are in Christ Jesus. For the law of the Spirit of life has set you free in Christ Jesus from the law of sin and death (i.e. guilt, shame, and condemnation). For God has done what the law, weakened by the flesh, could not do. By sending his own Son in the likeness of sinful flesh and for sin, he condemned sin in the flesh, in order that the righteous requirement of the law might be fulfilled in us, who walk not according to the flesh but according to the Spirit."

To the woman caught in adultery...

Jesus stood up and said, “Woman, where are they? Has no one condemned you?” She said, “No one, Lord.” And Jesus said, “Neither do I condemn you; go, and from now on sin no more.” - Jn 8:10‭-‬11

Though Christ clearly forgave her, it was also clear that he wanted her to abandon a life of destructive behavior (to others as well as herself); not to make her more acceptable to God but because he had already fully accepted (forgiven) her and desired her best, i.e. he loved her.

We are to avoid wrong behavior because we love Him who loved us first.

For a further discussion of the full extent of our forgiveness and God's love, click here.

For a discussion on the righteousness of Christ assigned to us, click here

For a discussion on guilt feelings versus actual guilt, click here

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¹To live in guilt and shame for our wrong doing and bad choices is saying Christ's work on our behalf did not adequately address these. This is an insult to Christ's work for us which dishonors him.