20 successful entrepreneurs share the most important lesson they learned in their 20s

Your 20s are a time for figuring out what you want from life.

Mistakes are unavoidable, but the truly successful learn from these setbacks and move on all the wiser.

We asked entrepreneurs, including a few "Shark Tank" investors and the cofounders of popular retailer Warby Parker, to share the most important lesson they learned in their 20s.

Here's what they said.