The great apostle had invested much of himself in the course of his ministry at Ephesus. It was one of his most successful ventures, and he had poured himself into it. He was about to let go, departing from them, commending them to God forever. This in-person farewell happened in the mid-50’s, and he wrote the book of Ephesians to them in the early 60’s. They stayed on his mind, in other words.