The Spirit of Truth is my teacher, as He is for each of us who believe "Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself;"
Abraham did not stagger in unbelief (he believed the promises of God) for he had a faith that was made strong...didn't doubt God was God...fully persuaded that what HE promised HE was able to do...that is faith. That kind of faith is what counts us as righteous. That is what counted Abraham as righteous.
It is that kind of faith that causes us to know that the same spirit that rose Jesus' body from the grave is giving (new) Life to us (IF we believe it can be so because all things are possible with God, though impossible for man), removing that heart of flesh and makes us to walk by HIS spirit in that newness of Life. Transformed, that our works of faith need not to be thought about and strived for because HIS spirit lives and causes it to be so...IF IF IF we believe it is possible because HE is God.
Faith brings Truth revealed and a Life hidden in Christ..."no longer I that live, but Christ in me..."
Faith strengthend (increased by God's grace because we see the bigger picture)...faith grows when we believe HE is the great I AM and that all things work together for our good. HE has grown my faith because I believed and KNOW He is God of all and HE causes all things to be possible in attaining the promises of God. HE has transformed my heart of flesh and caused me to know Him, intimately and to Trust HIM in every thing with all my heart, mind body and soul/life. That is what counts us as righteous...we are 'fully persuaded that what HE hat promised', not any works done out of the flesh.
Abraham took no thought (did not stagger in unbelief) just acted because of his faith...not because he thought it would fill up his 'bank' of righteous deeds. Thought has to do with the mind and does not come from faith for what the flesh thinks and what God desires of us are contrary to each other.
Would you take your son and attempt to sacrifice him on an altar just to get brownie points with God? Or would it have to be something God desired and you believed Him? This example given in scripture shows the difference between faith and works, though faith without works is dead. Faith causes 'different' works than the mind thinks...and that is the difference between flesh and spirit...our actions that come because of faith, not in the reverse.
Romans 4:20-25 Young's Literal Translation (YLT)
20 and at the promise of God did not stagger in unbelief, but was strengthened in faith, having given glory to God,
21 and having been fully persuaded that what He hath promised He is able also to do:
22 wherefore also it was reckoned to him to righteousness.
23 And it was not written on his account alone, that it was reckoned to him,
24 but also on ours, to whom it is about to be reckoned -- to us believing on Him who did raise up Jesus our Lord out of the dead,