Certain subjects yield a general power that may be applied in any direction and should be studied by all.
John LockeHe would be laughed at, that should go about to make a fine dancer out of a country hedger, at past fifty. And he will not have much better success, who shall endeavour, at that age, to make a man reason well, or speak handsomely, who has never been used to it, though you should lay before him a collection of all the best precepts of logic or oratory.
John LockeThere cannot any one moral rule be proposed whereof a man may not justly demand a reason.
John Locke