Romans 5:3-4

And not only this, but (with joy) let us exult in our sufferings and rejoice in our hardships, knowing that hardship (distress, pressure, trouble) produces patient endurance; and endurance, proven character (spiritual maturity); and proven character, hope and confident assurance (of eternal salvation).

Paul endured more than we can imagine for the spreading of the gospel. Paul tells us to keep our attitude joyful and focus on the Word and God building our character. We are to keep our faith, speak faith-filled words, and ask God to help us endure and move us through hardships. To succeed through suffering, we have to increase our faith.