A man may live long, and die at last in ignorance of many truths, which his mind was capable of knowing, and that with certainty.
John LockeThere cannot any one moral rule be proposed whereof a man may not justly demand a reason.
John LockeA young man before he leaves the shelter of his father's house, and the guard of a tutor, should be fortify'd with resolution, and made acquainted with men, to secure his virtues, lest he should be led into some ruinous course, or fatal precipice, before he is sufficiently acquainted with the dangers of conversation, and his steadiness enough not to yield to every temptation.
John Locke