Abraham's trek from his home to the mountain that God would show him is anything but a slouch. Nor is it toward Gomorra. This is a long trek of faith toward an incredible test of faith and a resolute devotion of obedience to God. Three days. If it's me, my stomach is in knots after the first day. I am thinking through every possible scenario. I'm planning contingencies. I'm working out explanations. I'm wondering deep in my soul, is this really the voice and command of God? Did I hear him right? Did he really say that?
Today the only way we can know if a thought or idea is of God is by testing it against God's word. And then we can only know that the thought is not from God - if the thought is contrary to a clear command of Scripture. If it is not contrary to God's word, it may be from God, or it may be sanctified reason bubbling up in our minds.