someone new to His grace would have to come through this type of understanding.

Why would Paul appeal to Abraham as proof of his thesis of justification by faith? Was it solely because Abraham was one of the great Jewish Icons? I think there was a deeper theological reason why Paul used Abraham.

First of all Abraham was involved in a covenant that promised him an inheritance. Of some land between the Mediterranean Sea and the Dead Sea? No, Abraham was looking far beyond that!

“By faith Abraham obeyed when he was called to go out to the place which he would receive as an inheritance. And he went out, not knowing where he was going. By faith he dwelt in the land of promise as in a foreign country, dwellingto an insect bite (usually on the hindquarters) which the horse is trying to rid himself of, or in some cases a response to use of a whip on the flank or hindquarters. 
 Untrained horses may instinctually buck the first few times they have a saddle on the back if not given proper ground training, and occasionally, even with proper preparation. This is an instinctive defense mechanism.
 Having found that bucking the rider off results in not having to work, the horse does it to avoid being ridden.
 Disobedience to the riding aids, when a horse does not wish to do what is asked by the rider. Sometimes this is due to poor riding on the part of the person, but sometimes a horse attempts to evade