Thoughtandextensionmaybealsoconsideredasmodesofsubstance; inasfar, namely, asthesamemindmayhavemanydifferentthoughts, andthesamebody, withitssizeunchanged, maybeextendedinseveraldiverseways, atonetimemoreinlengthandlessinbreadthordepth, andatanothertimemoreinbreadthandlessinlength; andthentheyaremodallydistinguishedfromsubstance, andcanbeconceivednotlessclearlyanddistinctly, providedtheybenotregardedassubstancesorthingsseparatedfromothers, , wedistinguishthemfromthesesubstances, andtakethemforwhatintruththeyare: whereas, ontheotherhand, ifwewishtoconsiderthemapartfromthesubstancesinwhichtheyare, weshouldbythisitselfregardthemasself-subsistingthings, andthusconfoundtheideasofmodeandsubstance.
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Inthesamewaywewillbestapprehendthediversemodesofthought, asintellection, imagination, recollection, volition, etc., andalsothediversemodesofextension, orthosethatbelongtoextension, asallfigures, thesituationofpartsandtheirmotions, providedweconsiderthemsimplyasmodesofthethingsinwhichtheyare; andmotionasfarasitisconcerned, providedwethinkmerelyoflocomotion, withoutseekingtoknowtheforcethatproducesit, andwhichneverthelessIwillessaytoexplaininitsownplace.
, affections, andappetitesmaybeclearlyknown, althoughwearefrequentlywronginourjudgmentsregardingthem.
