Meditation 10.7
7. The parts of the Whole, all which the Universe naturally includes, must necessarily perish, a word which is to be interpreted to denote change. Now if this were naturally evil as well as necessary for the parts, the Whole would not continue to be in a right condition while its parts were tending to change and had been put together specifically with a view to perishing. (For whether did Nature herself undertake to injure the parts of herself and to create them with a tendency to evil, and bound by necessity to fall into evil, or did such things come to pass without her knowledge? Neither view is credible.)
But now suppose one dispensed with Nature and expounded facts by way of 'natural law'; how absurd it is in one breath to assert that the parts of the Whole change by natural law, and in the same moment to be surprised or indignant as though at an occurrence in violation of natural law, particularly when the dissolution of each is taking place into the elements out of which each is composed. For this dissolution is either a dissipation of the atoms out of which they were compounded or else a turning of the solid into its earthy and of the vital spirit into its airy part, so that these too are caught up into the Reason of the Whole, whether the Whole returns periodically to fire or is renewed by eternal exchanges.
And do not imagine this solid body and this vital spirit to be that of its original entry into existence, for all this it took in only yesterday or the day before, an influx from foodstuffs and the atmosphere which is respired; what is changing then is what it took in, not what its mother brought into the world. And even suppose that what thus is changing binds you intimately to the individual self, that is in fact nothing, I think, to affect my present argument.