We have by daily experience clear evidence of motion produced both by impulse and by thought; but the manner how, hardly comes within our comprehension: we are equally at a loss in both.
Eguneroko esperientziak bai bulkadaz eta bai pentsamenduz eragindako higiduren berri argia ematen digu, baina nekez ulertzen dugun hori nola gertatzen den eta, kasu batean zein bestean, era berean galduta aurkitzen gara.