Contradiction with Matthew 5:48
This verse calls for perfection, whereas 1 Thessalonians 3:13 suggests steadfastness until Christ's return.
Matthew 5:48: Be ye therefore perfect, even as your Father which is in heaven is perfect.
Contradiction with Romans 3:23
This verse states that all have sinned, suggesting imperfection which contrasts with being unblameable in holiness.
Romans 3:23: For all have sinned, and come short of the glory of God;
Contradiction with Ecclesiastes 7:20
Suggests there is not a just man on earth who does good and does not sin, contrasting with a call to holiness.
Ecclesiastes 7:20: For [there is] not a just man upon earth, that doeth good, and sinneth not.
Contradiction with 1 John 1:8
Claims if we say we have no sin, we deceive ourselves, contradicting the notion of being unblameable.
1 John 1:8: If we say that we have no sin, we deceive ourselves, and the truth is not in us.
Contradiction with Isaiah 64:6
Describes all our righteous acts as filthy rags, which contrasts with the idea of standing blameless before God.
Isaiah 64:6: But we are all as an unclean [thing], and all our righteousnesses [are] as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away.