Some sorts of Passions seem to be in the Heart; as, Love, Hate, Grief, Joy, Fear, and the like; and all Imaginations, Fancies, Opinions, Inventions, _&c._ in the Head. But, mistake me not, I do not say, that none of the other Parts of a Man have not Passions and Conceptions: but, I say, they are not after the same manner, or way, as in the Heart, or Head: as for example, Every Part of a Man's Body is sensible, yet not after one and the same manner: for, every Part of a Man's Body hath different perceptions, as I have formerly declared, and yet may agree in general actions: but, unless the several composed Parts of a Human Creature, had not several perceptive actions, it were impossible to make a general perception, either amongst the several Parts of their own Society, or of Foreign Objects. But, it is impossible for me to describe the different manners and ways of the particular Parts, or the different actions of any one Part: for, what Man can describe the different perceptive actions of that composed Part, the Eye, and so of the rest of the Parts. CHAP. XX. That Associations, Divisions, and Alterations, cause several Effects. The Rational and Sensitive Corporeal Motions, are the perceptive Parts of Nature; and that which causes acquaintance amongst some parts, is their Uniting and Association: That which loses acquaintance of other Parts, is their Divisions and Alterations: for, as Self-compositions cause particular Knowledges, or Acquaintances: So Self-divisions cause particular Ignorances, or Forgetfulnesses: for, as all kinds and sorts of Creatures are produced, nourished, and encreased by the Association of Parts; so are all kinds and sorts of Perceptions; and according as their Associations, or their Compositions do last, so doth their Acquaintance; which is the cause, that the Observations and Experiences of several and particular Creatures, such as Men, in several and particular Ages, joyned as into one Man or Age, causes strong and long-liv'd Opinions, subtile and ingenious Inventions, happy and profitable Advantages; as also, probable Conjectures, and many Truths, of many Causes and Effects: Whereas, the Divisions of particular Societies, causes what we name Death, Ignorance, Forgetfulness, Obscurity of particular Creatures, and of perceptive Knowledges; so that as particular perceptive Knowledges do alter and change, so do particular Creatures: for, though the Kinds and Sorts last, yet the Particulars do not. CHAP. XXI. Of the Differences between Self-Love, and Passionate Love.