"It is the mark of an educated mind to be able to entertain a thought without accepting it."
Info & reflection: The idea itself is a precise epistemic skill: being able to hold a thought, examine it and let it go without feeling threatened and without having to adopt it. Separating understanding from acceptance. It is also a description of intellectual maturity as a stance, not as content.
⚠️ Apocryphal attribution: this quote circulates as Aristotle's but it does not appear in any of his works. The first documented occurrence is in Lowell Bennion's Religion and the Pursuit of Truth (1959), where it is presented as inspired by Aristotle's thought, not quoted directly. The likely root is the real Aristotle of the Nicomachean Ethics, I.3 (W. D. Ross translation):
"It is the mark of an educated man to look for precision in each class of things just so far as the nature of the subject admits."
The authentic idea is about epistemic precision, which is different from the tolerance of other people's thoughts in the apocryphal quote, though related. Classification: apocryphal.