I'd only been married a couple months when a friend who'd been married much longer said to me, "Someday, you'll be so annoyed with your spouse that you'll want to spit. When that happens — and, believe me, it will — try to remind yourself of the things about him that made you fall in love. You'll probably discover those are the very things that annoy you the most."
I'm a tortoise. I've always been slow and steady. When I was a kid I would eat around my plate, one item at a time — finish the peas and then move on to the potatoes. And that's been my philosophy ever since. Uneaten potatoes don't bother me, as long as I'm enjoying the peas. I'll get to the next thing when I get to it, and eventually I'll eat the whole plate.
I married a hare. That pile of uneaten potatoes makes him crazy. He has to eat some of everything on his plate — peas, potatoes, meat, then take a sip of wine, and don't forget the desert. Of course, that's what made me fall in love with him. He's so vibrant, so daring, so full of vim and vigor, so the opposite of me.
When I get angry at his inability to sit still, to focus on finishing one idea before moving on to the next big thing — his inability to clean up the mess he made remodeling the kitchen, because it had to get done today (hypothetically speaking, of course) — I remind myself that's what I love about him.
If I'd married another tortoise, we'd never have any fun, and I'd have no one to prod me to try the next big thing.