The System of the Vedanta according to Badarayana's Brahma-Sutras and Cankara's Commentary c7.s3.t7.8

c7.s3.t7.8

“How then can it be proved that the whole worldly action is only something interior, and that beyond the presentation, there are no external things?—For the reason that they are impossible! For let it be taken for granted that there are exterior objects, e.g., solid bodies, they must be either infinitely small (paramāṇu) or an aggregate of the infinitely small; now that of which our perception can trace the limit as a solid body, etc., cannot be infinitely small, because the infinitely small is not visible and knowable; so also no aggregate of the infinitely small; for this can neither be thought of, as different from the infinitely small, nor as identical with it [p. 568] [not different, for it is made up of the infinitely small, for it would then escape observation in all its parts]. The same is true of species [jāti, which exist only in individuals].”