Serendipity is not only an essential input to creative thinking, it often serves up unexpected benefits elsewhere. There’s no way of knowing in advance precisely how — and whether — anything you learn or become interested in will benefit you. Yet sometimes you find yourself needing idea or technique and there it is; right from an area of interest or learning you undertook years ago with no thought it would ever be useful.
And I especially like this part:
Learn all you can about anything that interests you. Never mind if it’s “useful” or “relevant.” It’s all relevant. If you’re passionate about cats, or cars, or canyons, learn all you can about them. If you love hiking, learn all you can about the sport and the places you hike through. Keep adding to your learning. One day — you won’t be able to predict when, so don’t worry about it — it’ll be exactly what you need the most.
(The whole article is worth reading, I just figured I'd share a few quotes here, as someone who has gotten a ton of unexpected benefit from simply being fascinated with things).