Scientists actively approach the door to knowledge—the boundary of the domain of what we know. We question and explore and we change our views when facts and logic force us to do so. We are confident only in what we can verify through experiments or in what we can deduce from experimentally confirmed hypotheses.

Knocking On Heaven's Door: How Physics and Scientific Thinking Illuminate our Universe (ed. Random House, 2012) - ISBN: 9781448161966