Do not be too confident in your own judgment. Cease to be sure that you are always right, and others always wrong. Be distrustful of your own opinion when you find it contrary to that of older men than yourself, and especially to that of your own parents. Age gives experience and therefore deserves respect. Never be ashamed of being a learner. The wisest men would tell you they are always learners, and are humbled to find after all how little they really know.
— J. C. Ryle, quoted in Stand Fast In the Way of Truth by Douglas Bond, p. 53