Let's throw an idea out there that is probably one of the simplest things you can do to really strengthen your marriage.
In his last post, A Husband made brief mention of something that I want to address on its own. It's a matter of steering clear of one word, making up your mind never to bring it up when referring to your relationship with your wife: Divorce.
Make up your mind that in your interactions with your wife, you absolutely will not bring up the possibility of your marriage ending in divorce. Not during arguments, not in passing comments, not even while joking (even if she is laughing along).
I don't say this because of anything that has to do with the word itself; it's just the whole concept and possibility it represents. You may not even realize it, but when you introduce and acknowledge the possibility of divorce into your marriage relationship, it isn't easily forgotten and doesn't easily vanish, especially when the going gets tough.
The lifelong commitment you made when you married her was way too awesome, courageous, and manly a thing to slowly chip away at through careless and unnecessary comments about divorce.