Let us begin with Abraham and learn how this friend of God was justified and saved. Not because he left his country, his relatives, his father’s house; not because he was circumcised; not because he stood ready to sacrifice his own son Isaac in whom he had the promise of posterity. Abraham was justified because he believed. Paul’s argumentation runs like this: “Since this is the unmistakable testimony of Holy Writ, why do you take your stand upon circumcision and the Law? Was not Abraham, your father, of whom you make so much, justified and saved without circumcision and the Law by faith alone?” Paul therefore concludes: “They which are of faith, the same are the children of Abraham.” Abraham was the father of the faithful. In order to be a child of the believing Abraham you must believe as he did. Otherwise you are merely the physical offspring of the procreating Abraham, i.e., you were conceived and born in sin unto wrath and condemnation. Ishmael and Isaac were both the natural children of Abraham. By rights Ishmael should have enjoyed the prerogatives of the firstborn, if physical generation had any special value. Nevertheless he was left out in the cold while Isaac was called. This goes to prove that the children of faith are the real children of Abraham. Some find fault with Paul for applying the term “faith” in Genesis 15:6 to Christ. They think Paul’s use of the term too wide and general. They think its meaning should be restricted to the context. They claim Abraham’s faith had no more in it than a belief in the promise of God that he should have seed.