Romans, Chapter 8. All of it.

11:If the Spirit of him who raised Jesus from the dead dwells in you, he who raised Christ from the dead will give life to your mortal bodies also through his Spirit that dwells in you.
So then, brothers and sisters, we are debtors, not to the flesh, to live according to the flesh— for if you live according to the flesh, you will die; but if by the Spirit you put to death the deeds of the body, you will live. For all who are led by the Spirit of God are children of God.
For you did not receive a spirit of slavery to fall back into fear, but you have received a spirit of adoption.

When we cry, "Abba! Father!" it is that very Spirit bearing witness with our spirit that we are children of God, and if children, then heirs, heirs of God and joint heirs with Christ—if, in fact, we suffer with him so that we may also be glorified with him.

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26: Spirit helps us in our weakness; for we do not know how to pray as we ought, but that very Spirit intercedes with sighs too deep for words. And God, who searches the heart, knows what is the mind of the Spirit, because the Spirit intercedes for the saints according to the will of God. We know that all things work together for good for those who love God, who are called according to his purpose.

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34: Who is to condemn? It is Christ Jesus, who died, yes, who was raised, who is at the right hand of God, who indeed intercedes for us. Who will separate us from the love of Christ? Will hardship, or distress, or persecution, or famine, or nakedness, or peril, or sword?
As it is written, "For your sake we are being killed all day long; we are accounted as sheep to be slaughtered."

No, in all these things we are more than conquerors through him who loved us.

For I am convinced that neither death, nor life, nor angels, nor rulers, nor things present, nor things to come, nor powers, nor height, nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord.