_Madam_, all what I speak, is under the liberty of Natural Philosophy, and by the Light of Reason onely, not of Revelation; and my Reason being not infallible; I will not declare my Opinions for an infallible Truth: Neither do I think, that they are offensive either to Church or State, for I submit to the Laws of One, and believe the Doctrine of the Other, so much, that if it were for the advantage of either, I should be willing to sacrifice my Life, especially for the Church; yea, had I millions of Lives, and every Life was either to suffer torment or to live in ease, I would prefer torment for the benefit of the Church; and therefore, if I knew that my Opinions should give any offence to the Church, I should be ready every minute to alter them: And as much as I am bound in all duty to the obedience of the Church, as much am I particularly bound to your Ladiship, for your entire love and sincere affection towards me, for which I shall live and die, Madam, _Your most faithful Friend,_ _and humble Servant._ IV. _MADAM,_ I have chosen, in the first place, the Work of that famous Philosopher _Hobbs_ called _Leviathan_, wherein I find he sayes,[1] _That the cause of sense or sensitive perception is the external body or Object, which presses the Organ proper to each Sense_. To which I answer, according to the ground of my own _Philosophical Opinions_, That all things, and therefore outward objects as well as sensitive organs, have both Sense and Reason, yet neither the objects nor the organs are the cause of them; for Perception is but the effect of the Sensitive and rational Motions, and not the Motions of the Perception; neither doth the pressure of parts upon parts make Perception; for although Matter by the power of self-motion is as much composeable as divideable, and parts do joyn to parts, yet that doth not make perception; nay, the several parts, betwixt which the Perception is made, may be at such a distance, as not capable to press: As for example, Two men may see or hear each other at a distance, and yet there may be other bodies between them, that do not move to those perceptions, so that no pressure can be made, for all pressures are by some constraint and force; wherefore, according to my Opinion, the Sensitive and Rational free Motions, do pattern out each others object, as Figure and Voice in each others Eye and Ear; for Life and Knowledge, which I name Rational and Sensitive Matter, are in every Creature, and in all parts of every Creature, and make all perceptions in Nature, because they are the self-moving parts of Nature, and according as those Corporeal, Rational, and Sensitive Motions move, such or such perceptions are made: But these self-moving parts being of different degrees (for the Rational matter is purer then the Sensitive) it causes a double perception in all Creatures, whereof one is made by the Rational corporeal motions, and the other by the Sensitive; and