He was promised the opportunity of being a father of many nations. Abraham's faith had grown in such a way that anything that God promised him would not at all have been questioned nor considered. This is the kind of faith needed by Christians today to accomplish the work of God that they have been entrusted with. Jesus knew what He was going to do. He knew what He was going to accomplish, and how He would accomplish it.
Faith is substance or as indicated faith is actuality.
This principle of protection is certainly given to us. When God gives a call there is a cost. When God calls it should be similar to the military draft. When God calls, you calculate the investment that you are to render to Him and then go. The cost may involve giving up a lucrative job and going to a place without promised support.