Ruth and I don't have a perfect marriage, but we have a...

Ruth and I don't have a perfect marriage, but we have a great one. How can I say two things that seem so contradictory? In a perfect marriage, everything is always the finest and best imaginable; like a Greek statue, the proportions are exact and the finish is unblemished. Who knows any human being lke that? For a marriage couple to expect perfection in each other is unrealistic.