The test of Abraham giving Isaac is this: Can one who had nothing freely give back to God what God had freely given him?  The story has a happy ending but the test was real.  We have nothing that we did not receive.  If we grasp, hoard or use for ourselves what God has given us to give, then our spiritual development has come to a screeching halt.  To set ourselves apart to God who gave us life is joyful gratitude, true worship, and real holiness.

Now it came about after these things, that God tested Abraham, and said to him, “Abraham!” And he said, “Here I am.” He said, “Take now your son, your only son, whom you love, Isaac, and go to the land of Moriah, and offer him there as a burnt offering on one of the mountains of which I will tell you” Gen 22:1-2 (NASB).