when abraham freely offered his own son to god, god made complete the covenant he initiated with him in the circumcision and guaranteed his descendents would number like the stars. the circumcision was only the first condition of that covenant, the second (the offering of his son) was concealed from abraham until he had raised his hand to strike. it was the second, hidden condition that was the real important one. jesus' offering of himself was not conditional, nobody had to pay him to do it, and was done for all men. participation in the new covenant requires assent and your own. once you have gained the knowledge of truth in the gospel, you attain certain obligations.  to whom much is given, much is required. from one in whom much is entrusted, more will be asked. this is the parable of talents.
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