“And even they, if they do not continue in their unbelief, will be grafted in, for God has the power to graft them in again.”
~Romans 11:23~

“In this passage (Romans 8:5-11) Paul is drawing a contrast between two kinds of life.

(i) There is the life which is dominated by sinful human nature; the life whose focus and center is self; the life that is absorbed in the things that fascinate sinful human nature; the life whose only law is its own desires; the life which takes what it likes where it likes; In different people that life will be differently described. It may be passion-controlled, or lust-controlled, or pride-controlled, or ambition-controlled. It’s characteristic is its absorption in the things that human nature without Christ sets his heart upon.

(ii) There is the life that is dominated by the Spirit of God. In the man’s heart is the Spirit. As he lives in the air, he lives in Christ, never separated from Him. As he breathes in the air, and the air fills him, so Christ fills him. He has no mind of his own. Christ is his mind. He has no desires of his own; the will of Christ is his only law.”

~William Barclay, The Letter to the Romans (The Daily Study Bible Series)