Genesis 22:8-12: in context

At the height of Abraham's testing, he binds his son Isaac, lays him on the altar, and stretches out his hand with the knife. Then the angel of the LORD calls out: Abraham, Abraham! Do not lay your hand on the boy, or do anything to him; for now I know that you fear God, since you have not withheld your son, your only son, from me. Abraham was stopped before the terrible deed, and Isaac was spared; but Abraham had shown, in his willingness, that he would withhold nothing from God, not even the son he loved most.

The word the angel uses is the key: you have not withheld your son, your only son, from me. Abraham's faith was proven in his willingness to give God even what was most precious to him, the son of promise, the son he loved, holding nothing back. This does not mean God delighted in the demand for its own sake, or that God desires such sacrifices; God stopped Abraham and spared Isaac, and provided a substitute. But Abraham's heart was revealed: he would not withhold from God even what he loved most. His trust in God was such that he held nothing back, even his dearest treasure. This searches the depth of our own surrender to God. We can be willing to give God many things while withholding what is most precious to us, keeping back some treasure we will not surrender, some person, possession, ambition, or comfort that we hold onto as our own, not God's. Abraham's faith was one that withheld nothing, that would give God even his only son. And the question this presses on us is whether there is something we are withholding from God, some dearest thing we keep back, unwilling to hold it with an open hand or surrender it to him. Whoever loves son or daughter more than me, Jesus says, is not worthy of me; the call is to hold nothing, not even our dearest loves, above God or back from him. This is not a call to love others less, but to love God most, and to withhold nothing from him, holding even our treasures with open hands. And there is a profound comfort joined to this searching. For the God who asked Abraham not to withhold his only son is the God who himself did not withhold his own Son for us. He who did not spare his own Son, Paul says, but gave him up for us all, how will he not also with him freely give us all things. God asks us to withhold nothing from him because he withheld nothing from us, giving his own Son. This assures us that the God to whom we surrender our treasures is the God who gave us his greatest treasure. This calls us to a surrender that withholds nothing. Is there some dearest thing we keep back from God, unwilling to surrender it? Abraham withheld not even his only son; and the God who asks this is the one who did not withhold his own Son for us. We are called to hold even our treasures with open hands, withholding nothing from the God who withheld nothing from us.

Is there some dearest thing I withhold from God, a person, possession, ambition, or comfort I keep back as my own and will not surrender, and can Abraham, who did not withhold his son, his only son, from God, together with the God who himself did not withhold his own Son for me, move me to a surrender that holds nothing back, giving God even my treasures with open hands, trusting the One who withheld nothing from me?