We are involved in an awesome adventure, but we are blind to many particulars that will affect us. What is emphasized from Abraham's life is his trust in God. Trust is the most powerful fruit, the strongest, clearest evidence, of belief. Trust is faith in action, setting a truly converted person apart from one who believes only intellectually. The Christian must live his life by faith.
Lack of trust is a major reason why young people "go bad" in their teen years. They do not really trust their parents. Rather, they trust other teens; they trust what they see in movies extolling the popular culture; they trust what they hear songs saying to their emotions. They trust their own thoughts and their own experiences, but Mom and Dad are low on the influence scale.
Notice, however, what Jesus says of Abraham regarding this principle: "Your father Abraham rejoiced to see My day, and he saw it and was glad" (John 8:56). Abraham saw Christ as the Savior and Author of eternal salvation in his mind's eye and demonstrated his trust in this fact through his conduct. Abraham's proceeding on despite not knowing where he was going demonstrates that he put himself unreservedly in God's hands. He actually performed what he said he believed despite its potential cost. His feet, as it were, gave proof of what was in his heart by where and how he walked.
Jesus teaches this principle in Matthew 16:24-26:
Then Jesus said to His disciples, "If anyone desires to come after Me, let him deny himself, and take up his cross, and follow Me. For whoever desires to save his life will lose it, but whoever loses his life for My sake will find it. For what profit is it to a man if he gains the whole world, and loses his own soul? Or what will a man give in exchange for his soul?"
Abraham did this to a degree few have even come close to matching. To deny ourselves is to set aside our claims on the day-to-day use of our time and energy in favor of another. Often God's commands seem demanding, even severe, but accepting God's calling has placed the burden of this responsibility squarely on our shoulders.
There can be no doubt that Abraham's neighbors thought he was loopy, even as Noah's neighbors undoubtedly thought he was crazy for building an ark. People of the world cannot truly understand the actions of one who walks by faith because their perspectives on the value of things are usually quite different. If confronted with similar knowledge and circumstances without God's gracious calling and gift of faith, the unconverted will adjust through compromise and self-justification. They will rationalize that under their "special" circumstances, God would surely not expect such things of them. The world of the unconverted is governed by its limited, carnal senses and feelings, not by faith in God's character. They walk by sight.