To me, though I am the very least of all the saints (God's consecrated people), this grace (favor, privilege) was granted and graciously entrusted: to proclaim to the Gentiles the unending (boundless, fathomless, incalculable, and exhaustless) riches of Christ [wealth which no human being could have searched out], In Whom, because of our faith in Him, we dare to have the boldness (courage and confidence) of free access (an unreserved approach to God with freedom and without fear).
The reason Paul could write this and proclaim this is his humility..."I am the least of all believers." Yet we have boldness before the throne. How do the two reconcile? Boldness can be peaceful and humble. When we confess our sins our hearts humbly go into the throne but not afraid. He offers forgiveness so freely there is no need for fear.
The riches we receive when we pray are unfathomable and exhaustless...Because of us? No we each are the least of believers similar to Paul. It's because of what Jesus did on the cross. He gave us joy and mercy and spiritual riches so many, so much. There's no way to count the spiritual blessings or even find out what they are right now. But one of them is prayer.
Prayer is talking to God as if He was your most intimate personal friend. He understands even the things you can't quite put into words. He understands when you trip over your words. He understands when you're empty. He also answers your prayer. If you believe He hears you, you'll have exactly what you need. If you have trouble believing He makes up for that...you are saved by grace through faith, but even faith didn't come from yourself. It's a precious gift from the Ancient of Days. (Ephesians 2:8, 9 Author's paraphrase)