Romans 8:31-32 — What shall we then say to these things? If God be for us, who can be against us He that spared not His own Son, but delivered Him up for us all, how shall He not with Him also freely give us all things?
Spared — the same word is used in the Septuagint in Genesis 22:16, referring to Abraham's offering of Isaac.
In Romans 4:25 and here, the Father gave the Son. In Galatians 2:20, the Son gave Himself. I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave Himself for me. This shows the oneness of the Father and Son.
Freely give = bestow as a gift of grace
When men form a partnership one man puts up money and another man puts up experience, or some similar division of various assets. But when we form a partnership with God He demands that we do it on His terms. We put up weakness and He puts in His strength; we put up sin and He furnishes pardoning grace; we cast in our nothingess and He answers with His all-ness. God and the worm! Let not anyone dare attack that parnership. Yet how loath men are to accept their own bankruptcy to have His fullness — Donald Grey Barnhouse, God's Heirs, page 179.