Your assumptions are your windows on the world. Scrub them off every once in a while, or the light won't come in.

One can give ‘correct’ opinion only if one has an open mind.

A prepared mind is always made up; it knows what it thinks and why it thinks that. When it's time to change, it just makes itself up a different way. A really made-up mind--made up properly, knowing what it knows and on what basis it knows it--is open. People close an undecided mind because they're trying to protect those sore uncertainties from getting bumped and scraped.

Having an open mind is the most important precondition for creatingnew ideas.