I’d like to close this chapter with an essential caveat about persistence from Built to Last. Of all the paragraphs I’ve authored or co-authored in thirty years, this is one of the most essential for entrepreneurs and leaders of early-stage ventures, reproduced here as a reminder to keep firmly in mind as you build your company:

The builders of visionary companies were highly persistent, living to the motto: Never, never, never give up. But what to persist with? The company. Be prepared to kill, revise, or evolve an idea . . . but never give up on the company. If you equate the success of your company with the success of a specific idea—as many businesspeople do—then you’re more likely to give up on the company if that idea fails; and if that idea happens to succeed, you’re more likely to have an emotional love affair with that idea and stick with it too long, when the company should be moving vigorously on to other things. But if you see the ultimate creation as the company, not the execution of a specific idea . . . then you can persist beyond any specific idea—good or bad— and move toward becoming an enduring great institution.

It’s just like how many marketing, sales, and creative teams often don’t talk to engineering. Too many numbers. Too black and white. Too many geeks in one room geeking out.

But I wanted to understand the squishy stuff and the geeky stuff. And I liked all of it. I could also translate back and forth—explain the squish to engineers, translate the 1s and 0s to the creatives. I could synthesize all the pieces and keep the whole company in my head.

So to preserve what you love, have your team write down the things they value most and build a plan to continue them. And remember it’s not necessarily the obvious stuff that binds people to your company—it can be small things, silly things.

Your company is an organism; its cells need to divide to multiply, they need to differentiate to become something new. Don’t worry about what you’re going to lose—think about what you’re going to become.

So the dating phase of any potential acquisition is crucial. You have to check the sink for dirty dishes. You have to spot the toenail on the dining table. Look at the reporting structure and the way they hire and fire employees. Dig into what perks everyone gets. Talk about management philosophy. Make concrete plans for exactly what’s going to happen postsale.

Are you going to integrate or keep your cultures separate? What will you do about overlap? Where will this team go? Who will work on this product?

But always know that you won’t be able to predict the future. Things will change—maybe in your favor, maybe not. And so, eventually, you just have to do it. Sign on the dotted line. Trust that it’ll work out.

My advice is to always be cautiously optimistic. Trust, but verify.

Assume people have the best intentions, then make sure they’re following through on them. And take the risk. Leap. Buy the company. Sell the company. Or do neither. Just follow your gut and don’t be scared (or, rather, be scared but make the decision anyway).