In 2 Corinthians chapter 12, Paul prays to God and asks him to remove a "thorn in the flesh." God responds by saying, "My grace is sufficient for you." Paul concludes that he can be content in his struggle, whatever it was.

In Christ, we have something far better than what the Israelites had with the law. When the Lord opens our hearts to embrace the salvation provided for us through Jesus, the spiritual veil that kept us in spiritual darkness is removed. As we are then able to enjoy the presence of God, he changes us through the power of the Holy Spirit.

When Paul says,"...it is through him that we utter our Amen to God..." in 2 Corinthians, he is talking about our coming to God with faith in his promises and our praying through Christ with Jesus as our great high priest so that in Christ all the promises of God for us are "Yes and amen." Paul also says that God has"given us his Spirit in our hearts." When we pray, we can see all three persons of the Trinity at work.

In 2 Corinthians the apostle Paul expresses his confidence that God will deliver him from the persecution and suffering that he experiences, but he also believes God will use the prayers of the saints to help bring about that deliverance. We don't always know how God is using our prayers to help other people.

Paul lists 9 spiritual gifts in 1st Corinthians chapter 12 of which speaking in tongues is included. In chapter 14 he talks about praying in tongues and that some of the benefits of doing this are to give praise and thanksgiving to God. God gives this gift to come Christians and it has valuable use in prayer. 

The apostle Paul gives relatively little teaching on prayer in 1st Corinthians but in his teaching on the Lord's Supper, he points to an important role of prayer as a way of examining ourselves. Praying Psalm 139 can be a great way to do that.

In 1 Corinthians we can learn from the apostle Paul how to pray for Christians who are less than spiritually mature and far from God. Our trust must be in the faithfulness of God. 

Paul appeals to the believers in Rome for prayer. He feels it is essential for them to enter into prayer with him and for him for God's work in his life.  When we pray for people who are doing the work of ministry, whether in our local church or internationally,  we are joining in partnership with them and they are very much in need of that partnership. 

All who are truly Christians have the Holy Spirit dwelling within.  The Holy Spirit leads us and bears witness to us when we pray.  The Holy Spirit helps us to pray effectively. 

The book of Romans is the most theological of all the books that the apostle Paul wrote.  In the opening of this book, Paul notes his prayers for the people in Rome. Paul provides a wonderful model for how to pray for other people.