Something in the way that your partner naturally looks at life or operates in the world is a big eye-opener for you, in a great way. Their natural enthusiasm for life, their optimism about the future and their savviness about grabbing onto opportunities as they arise really expands your horizons, because they show you a new way of doing things. This isn't in any formal way; whatever you do together as a couple, on your dates, for example, is naturally an eye-opening, positive, beneficial experience for you both, but especially you.
Also because of their influence, you two might get up to some pretty crazy, risky antics when you're out together! They might not be into the dull, standard dinner-and-a-movie date; their style could be more like a morning bungee jump or maybe riding horses up into the mountains. And they don't want to follow the guide! They make their own way, and you look to them for inspiration and an example of what kind of person you want to be, and how to chase down your own future and good luck. Just don't let all this good feeling translate into laziness or self-indulgence. Don't get into risk-taking just for its own sake; every risk you take as a couple should have a calculatedly beneficial outcome.