3 attitudes of a critical thinker

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In Bertrand Russell's conception...a certain set of attitudes characterizes the outlook of a critical person.

1. An open-minded outlook with respect to our beliefs, an "inward readiness" to give weight to the other side, where every question is regarded as open and where it is recognized that what passes for knowledge is sure to require correction.
2. A refusal to think that our own desires and wishes provide a key to understanding the world, recognizing that what we should like has no bearing whatever on what is.
3. Being tentative, without falling into a lazy scepticism (or dogmatic doubt), but holding one’s beliefs with the degree of conviction warranted by the evidence.

Source: Bertrand Russell on Critical Thinking