The Bible itself gives the rhyme or reason. It walks through the commands God gave to the patriarchs, to Moses and the Israelites, to the prophets and the judges and the kings.
The Bible then introduces Jesus and His crucifixion, and proceeds to explain how all of those laws and commands above were an imperfect approximation, and those who have accepted Jesus are not bound to them. Instead, we are given new instructions and guidelines based around avoiding evil attitudes (idolatry, malice, selfishness) and putting good attitudes into practice (love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, and self-control).
Living according to the ancient Jewish restrictions is explicitly overcome. Instead, each man and woman is taught to live their life as they have been called, but as part of a Church family and in an active relationship with Jesus.
You're not going to learn any of this by quote-mining, so if your exposure to the Bible is limited to lists of verses from its detractors, you won't get any of this. But if you actually read the thing, cover to cover, it's impossible to miss. It's spelled out. It's no mystery, nor do you have to read between the lines -- it's right there in the text.
