When we prefer to believe something, we may approach the relevant evidence by asking ourselves,"what evidence is there to support this belief?"...Note that this question is not unbiased: It directs our attention to supportive evidence and away from information that might contradict the desired conclusion. Because it is almost always possible to uncover some supportive evidence, the asymmetrical way we frame the question makes us overly likely to become convinced of what we hope to be true.
Thomas Gilovich, How We Know What Isn't So: The Fallibility of Human Reason in Everyday Life
beliefs, rational-thought, reasoning