therefore naturally immortal. 2 29

dergo no change in itself, no not from anypower, but a change of substance, or anni-hilation,

receives a particular direction,but is not changed in quan-tity, unless we take it relatively, or with respect to aterminus a quo. By N° 12. of the first section, if wefix on such a terminus, the resistance of matter is end-leily increasible. In receding from the terminus of rest,it may always receive another degree of celerity, andtherefore will make another degree of resistance. Thisis because of the degree of resistance it made to receivethat celerity. It could not make two degrees of resist-ance to be stopt, unless it had made two degrees of re-sistance to be put up into that motion. So that the in-crease of moment supposes a previous repetition of equalresistances to equal changes. And therefore this resistance■taken absolutely, is always the same, as much as the in-activity is, asinN 0 13. of that section. However, incase one should be tenacious of the contrary, not much.depends on this. But having mentioned moment as ana ffection of real motion in matter, let me be permittedto explain, and restrain a little, what Mr. Locke hathadvanced concerning the motion of all finite spirits. InBook 2. chap. 23. sect. 17 and 18. having enumeratedthe primary ideas peculiar to body and spirit, as contra-distinguished to each other, he makes mobility commonto them both; which he illustrates and defends, sect. ig,20 and 21- He hath before ascribed motivity, or a powerof putting body into motion by thought, to spirit, as oneof the ideas peculiar to it; so that by mobility h e seemsto mean a capacity in spirit of being moved, by some-thing ab extra, and not the power of moving, which is

3 included