There is great difference between a Natural Fool, and a Mad Man: for, Madness is a Disease, but a Natural Fool is a Defect; which Defect was some Error in his Production, that is, in the form and frame either of the Mind, or Sense, or both; for, the Sense may be a Natural Fool as well as the Reason; as we may observe in those sorts of Fools whom we name _Changelings_, whose Body is not only deformed, but all the Postures of the Body are defective, and appear as so many fools: but sometimes, only some Parts are fools; as for example; If a Man be born Blind, then only his Eyes are Fools; if Deaf, then only his Ears are Fools, which occasions his dumbness; Ears being the informing Parts, to speak; and wanting those informations, he cannot speak a Language. Also, if a Man is born lame, his Leggs are Fools; that is, those Parts have no knowledg of such Properties that belong to such Parts; but the Sensitive Parts may be wise, as being knowing; and the Rational Parts may be defective; which Defects, Man names _Irrational_. But this is to be noted, That there may be Natural and Accidental Fools, by some extraordinary Frights, or by extraordinary Sickness, or through the defects of Old Age. As for the Errors of Production, they are incurable; as also, those of Old Age; the First being an Error in the very Foundation, and the other a Decay of the whole Frame of the Building: for, after a Human Creature is brought to that perfection, as to be, as we may say, at full growth and strength, at the prime of his age; the Human Motions, and the very Nature of Man, after that time, begins to decay; for then the Human Motions begin to move rather to the dissolution, than to the continuance; although some Men last to very old Age, by reason the unity of their Society is regular and orderly, and moves so Sympathetically, as to commit few or no Disorders, or Irregularities; and such old Men are, for the most part, Healthful, and very wise, through long Experience; and their Society having got a habit of Regularity, is not apt to be disturbed by Forrein Parts. But this is to be noted, That sometimes the Sensitive Body decays, before the Rational Mind; and sometimes the Rational Mind, before the Sensitive Body. Also, this is to be noted, That when the Body is defective, but not the Mind; then the Mind is very industrious to find out Inventions of Art, to help the Defects that are natural. But pray mistake me not; for I do not say, That _all_ Deformities, or Defects, but only _some_ particular sorts of Deformity, or Defects, are Foolish. The Seventh Part. CHAP. I. Of the Sensitive Actions of Sleeping and Waking.