Should I Partner with a Big Company?

So one of the things a lot of startup founders like to talk with me about or have on their mind is, what should I focus on? There's so many things that I could be doing. Where should I be spending my time? Where should I be spending the company's resources? And oftentimes it'll be a kind of a story of, well, I could focus on this, which is my core product and my original idea, but on the other hand, there's a big company out there that's got a big name "and a lot of customers, and they're really excited about what we're doing, and they're saying that they could actually sell this product to all of their customers. What do you think I should do?" And I would just say, do not pin all of your hopes and dreams for growth on a partnership with a big company. Now, I'm not saying don't ever partner with a big company, I'm just saying go in eyes wide open and test first.