8 successful entrepreneurs share the worst advice they ever received

Devan Joseph

Mark Cuban speaks at Business Insider Ignition 2014.

Bad advice is easy to ignore. But sometimes the worst advice can stick with you, as a reminder of what matters most to your personal and professional fulfillment.

Entrepreneurs by definition have to go against the grain, and so conventional, albeit terrible, advice can be used as a motivational tool.

We've collected the worst advice successful entrepreneurs like Mark Cuban and Barbara Corcoran ever received.

Here's what it taught them.