I've often asked people this question: "What's the one thing?" Funny enough, it originally came from the movie "City Slickers". Later it got modified. The basis of the premise is that each human that lives his life has just one thing for his life, and it's up to each person to figure out what that one thing is. Later, it evolved into BEING one thing. We have to become the changes we wish to see, and therefore its both word and deed that would require you to be that one thing.
I actually saw this again, of all things, on a recent Kleenex commercial, lol! That's what triggered me to see if other people do, or should, think like me when it comes to this. In the commercial, a man is talking to another man about the death of his stepfather. The other guy says, "What's the one thing?" I whipped my head around to the TV when I heard this. I've asked that question for years about others or myself. The man had a quick reply, "Love... He had a lot of stresses and downfalls, a lot of hard times, but he never stopped loving life, loving family." That's a vague quote of what he really said, I've only seen it once, but that was the general idea, and the key word is accurate. The point is this: The guy had a response ready to go at such a broad question. Granted, it was scripted, but I think it still speaks true.
It may take a loss to realize how easy that question can be answered, but here's the question for you: What would people say was your one thing? Now, be honest with yourself. You can't say what you WANT people to say. Think long and hard about what someone would say was your one thing the day after your funeral. If you're comfortable enough with yourself, and you are true to others, then I think the one thing would coincide with what you want them to say. If you worry about it, wouldn't today be the day to start fixing that? No one lives forever, and many people will not be there tomorrow.
I've always been a strong and passionate person about my own mortality. Every day I go down three flights of stairs at least twice. Every day I drive my car at least four times. Every day I enter a convenient store that has been robbed multiple times. Almost once a year I go out to war. Someone may ask what my one thing is tomorrow. What would they say about you, and is it something to fix?