There is a beautiful passage near the beginning of one of Augustine’s great works, De Trinitate, in which Augustine writes: “Dear reader, whenever you are as certain about something as I am go forward with me; whenever you hesitate, seek with me; whenever you discover that you have gone wrong come back to me; or if I have gone wrong, call me back to you. In this way we will travel along the street of love together as we make our way toward him of whom it is said, ‘Seek his face always.’”
I don't remember how it started, but just a few blocks into the walk to our hotel the debate was on. Our conversation ranged wide—the scope and purpose of salvation, justification, sanctification, the sovereignty of God, the relationship of divine and human agency—never seeming to settle in on one thing. We argued as we walked one and a half miles of the city streets of Philadelphia, as we waited for lights to change at street crossings, as we took a wrong turn and had to retrace our steps; not even the check-in process at the hotel halted our conversation.