A sort of follow-up to this post on explanations that invoke sympathy. From Swift’s Tale of a Tub:
Let us therefore now conjecture how it comes to pass that none of these great prescribers do ever fail providing themselves and their notions with a number of implicit disciples, and I think the reason is easy to be assigned, for there is a peculiar string in the harmony of human understanding, which in several individuals is exactly of the same tuning. This, if you can dexterously screw up to its right key, and then strike gently upon it whenever you have the good fortune to light among those of the same pitch, they will by a secret necessary sympathy strike exactly at the same time. And in this one circumstance lies all the skill or luck of the matter; for, if you chance to jar the string among those who are either above or below your own height, instead of subscribing to your doctrine, they will tie you fast, call you mad, and feed you with bread and water. It is therefore a point of the nicest conduct to distinguish and adapt this noble talent with respect to the differences of persons and of times.
Stewart Duncan 