Disection of Romans passage

Romans 8:15-16

"15 For you did not receive a spirit that makes you a slave again to fear, but you received the Spirit of sonship (or adoption). And by him we cry, "Abba, Father." 16 The Spirit himself testifies with our spirit that we are God's children."

This is from the Matthew Henry Commentary:

But you have received the Spirit of adoption. Men may give a charter of adoption; but it is God’s prerogative, when he adopts, to give a spirit of adoption-the nature of children. The Spirit of adoption works in the children of God a filial love to God as a Father, a delight in him, and a dependence upon him, as a Father. A sanctified soul bears the image of God, as the child bears the image of the father.

That makes sense as does this:

V 16. Beareth witness with our spirit. Many a man has the witness of his own spirit to the goodness of his state who has not the concurring testimony of the Spirit. Many speak peace to themselves to whom the God of heaven does not speak peace. But those that are sanctified have God’s Spirit witnessing with their spirits, which is to be understood not of any immediate extraordinary revelation, but an ordinary work of the Spirit, in and by the means of comfort, speaking peace to the soul. This testimony is always agreeable to the written word, and is therefore always grounded upon sanctification; for the Spirit in the heart cannot contradict the Spirit in the word. The Spirit witnesses to none the privileges of children who have not the nature and disposition of children.