Marriage can, should, and must evolve. Don't be alarmed, and don't resent it. Be patient and kind, unflaggingly. In the long run, it's the unasked-for hot-water bottles on winter nights that matter more than the extravagant gestures. Express gratitude, especially for work that tends to get taken for granted. Identify problems as they arise, remembering that anger is flammable. When we've behaved like a donkey, remember that a sincere apology never diminishes the apologizer. Wrong turns teach us the right way.