God is at work in all the circumstances of your life to bring out the good for you, even if you had never heard of Romans 8:28. His work is not dependent upon your faith. But the comfort and joy that statement is intended to give you is dependent upon your believing it, upon your trusting in Him who is at work, even though you cannot see the outcome of that work.
Jerry BridgesThe wisdom of the chess player is displayed more in winning over a capable opponent than a novice. The wisdom of the general is displayed more in defeating a superior army than in subduing an inferior one. Even more so, the wisdom of God is displayed when He brings good to us and glory to Himself out of confusion and calamity rather than out of pleasant times.
Jerry BridgesIn order to trust God, we must always view our adverse circumstances through the eyes of faith, not of sense. And just as the faith of salvation comes through hearing the message of the gospel (Romans 10:17), so the faith to trust God in adversity comes through the Word of God alone. It is only in the Scriptures that we find an adequate view of God's relationship to and involvement in our painful circumstances. It is only from the Scriptures, applied to our hearts by the Holy Spirit, that we receive the grace to trust God in adversity.
Jerry Bridges