'Reason' in the Bible

For our reason for confidence is this: the testimony of our conscience, that with pure motives and sincerity which are from God -- not by human wisdom but by the grace of God -- we conducted ourselves in the world, and all the more toward you.

For this reason also I wrote you: to test you to see if you are obedient in everything.

For indeed he was crucified by reason of weakness, but he lives because of God's power. For we also are weak in him, but we will live together with him, because of God's power toward you.