I love these thoughts from Carl Sagan:
Try not to get overly attached to a hypothesis just because it’s yours. It’s only a way station in the pursuit of knowledge. Ask yourself why you like the idea. Compare it fairly with the alternatives. See if you can find reasons for rejecting it. If you don’t, others will.
It comes from a longer piece about challenging “facts” and “authorities” in the search for something closer to truth. You can read more here: Carl Sagan’s tools for critical thinking and detecting bullshit.