You're hiking in a dense forest and there's a large leaf lying on the ground a few feet in front of you.  You heard from someone once that such large leaves usually cover very deep holes.  The group behind you says all the large leaves they've ever encountered have been safe to walk across.

Do you walk across the leaf?

Everybody is telling you what to do.  They're the expert, they have the results, they know what you should be doing.

But do they really?  They might.  Their advice might make you a millionaire.  It might make you an idiot.

The difference is the degree to which you question.  Do you accept everything you see and hear as true?  Or do you actively question what's going on and learn from it?