CUSTOM settles habits of thinking in the understanding, as well as of determining in the will, and of motions in the body: all which seems to be but trains of motions in the animal spirits, which, once set a going, continue in the same steps they have been used to; which, by often treading, are worn into a smooth path, and the motion in it becomes easy, and as it were natural.
Ohiturak pentsatzeko azturak ezartzen ditu adimenean, erabakitzekoak nahimenean eta mugitzekoak gorputzean, hauek guztiak, dirudienez, ez direlarik animali espirituetan gertatzen diren higidura jarraituak besterik, behin abian jarriz gero, ohiturazko pausoak eginez segitzen duten higidurak, pausook sarri eginez eta ibiliaren ibiliaz azkenerako bidea tinko bihurtzea eta bertatik ibiltzeko mugimenduak errazak eta, nolabait esateko, naturalak izatea lortzen delarik.