When you come home from a long weary day, here is a bit of advice:
Scan the scene, attempt to find one thing your wife did today. Maybe the toys are all picked up, laundry is folded, dinner is ready, or the kitchen was swept. It doesn't matter how big or small. Thank your wife for this accomplishment--genuinely.
If you don't immediately see something, DO THIS: Thank your wife for not killing your children today.
A little affirmation and appreciation goes a long way.