Romans 5:4 - Matthew Poole's English Annotations on the Holy Bible

And patience, experience; viz. of God's sustentation and care of us, and of his faithfulness in fulfilling his promises, Psalms 91:15 Isaiah 43:2 2 Corinthians 1:4,5; as also of our own sincerity, and strength to endure and persevere, Matthew 13:21. And experience, hope; i.e. of the glory of God, as before in Romans 3:2, or hope of further mercy and seasonable deliverance. Believers find and feel that God hath delivered them, and doth deliver them, and in him they trust and hope that he will still deliver them.