For better or worse, cash is the oxygen of your business, and you can't last long in any environment without it.
I personally try to buy the best-quality items at the best price that do the least harm and from companies that are striving to do good - many of those companies are run by young entrepreneurs.
A startup is a company working to solve a problem where the solution is not obvious and success is not guaranteed.
It's impossible to predict crises - or to control them once they hit - but you can absolutely prime yourself to ride them out as best as possible.
I want to go at least 11 hours without food. I sat next to Hugh Jackman at a conference, and he told me he fasted 12 to 14 hours when he was training for the Wolverine movies. I've deluded myself into thinking I can effortlessly achieve the same body type as Hugh Jackman if I keep up this eating schedule.
For many startups, ideating is the fun part: coming up with ingenious schemes to grab eyeballs and start conversations. But before you dive into that stage, take a step back and define your goals.
When we were creating Warby Parker, for us it was about having a positive impact on the world and having a strong social mission.
Businesses should focus on solving problems, putting the customer first, delivering value - not gimmicks - and growing in a sustainable manner.
For every Mark Zuckerberg and Facebook, there's 30 other entrepreneurs that started their business after working for several years.
The idea that you don't spam people with five emails a day or that you offer free shipping just seemed obvious to us, because that's how we want to be treated as consumers.