None of God's law has been 'done away', though there is not always a literal application. Not every law of God has the same weight of importance.
Love, justice, mercy, and fidelity (the weightier matters of the law) God desires more than meticulous, mechanical religiosity.
Mike Ford explores the possible physical and spiritual significance of the prohibition to mix wool and linen which appears in Deuteronomy 22:11 and Leviticus 19:19. One explanation seems to come from the consumer protection corner, asserting that mixing fibers produces an inferior garment. Some commentaries refer to the …
The Acts 15 decision did not do away with God's law, but solved the question of circumcision and the misconception that it was a recipe for salvation.
We need to learn to judge in a godly manner, putting merciful restraints on our tendency to condemn or jump to conclusions. One size does not fit all.
We must emulate the ways of God, demonstrating justice in our lives, thoughts, words, and deeds, preparing to judge in God's Kingdom. Not all sins are equal.
Christ emphasizes that the internal, weightier matters, which change the heart, take precedence over external ceremonial concerns that don't change the heart.
Sins committed presumptuously by people of high responsibility (leaders) are judged more rigorously than those sins committed by people in ignorance.
Sometimes Christians fixate on past sins. But we cannot experience the joy of salvation while obsessing on past sins. Christ's blood covers sins repented of.
Christ provides a model of how to live a godly life in the flesh, living life the way God lives it. Using His light, we can navigate our way in this world.