Pure reason requires us to seek for every predicate of a thing its proper subject, and for this subject, which is itself necessarily nothing but a predicate, its subject, and so on indefinitely (or as far as we can reach).
Arrazoi hutsak eskatzen du, gauza baten predikatutzat bila dezagula gauza horri dagokion subjektua, eta honi ostera, zeina berriz ere derrigor predikatu hutsa baino ez baita, bila diezaiogula bere subjektua, eta hala hurrenez hurren infinituraino (edo behintzat, ailegatzen garen hartaraino).