Rationality means “thinking and acting according to reason. It is thinking with reasons, good reasons.
To be rational does not only depend on what you believe but more importantly on how you believe it; that ism, the way you have thought it out, the reasons you have provided, and the clarity and courage with which you have approached the problem.
To be rational is to use our ability to sift through the evidence and weight arguments and formulate reasons in the most efficient way. Rationality points to the manner of thinking rather than its ultimate conclusions.
Rationality, therefore, does not require truth; it only requires that one make the best possible use of all the information and reason at one’s disposal. Truth is that which is most rational to believe at a given time and in a given situation, on the basis of the best available evidence and the most careful thinking possible.
Rationality, unlike faith, is always open to being wrong. It follows the evidence, not the authority of a person or institution.