For it is only after we have learned from this great man that the intuitions or perceptions of space and time are quite different from empirical perceptions, entirely independent of any impression of the senses, conditioning it, not conditioned by it, i.e., are a priori, and therefore are not exposed to the illusions of sense; only after we have learned this, I say, can we comprehend that Euclid's logical method of treating mathematics is a useless precaution, a crutch for sound legs, that it is like a wanderer who during the night mistakes a bright, firm road for water, and carefully avoiding it, toils over the broken ground beside it, content to keep from point to point along the edge of the supposed water.
Zeren espiritu handi horrengandik ikasi dugunean espazioa eta denboraren begiespenak enpirikoaz zeharo bestelakoak direla, inpresio orotatik sentsuekiko erabat independenteak, horien baldintzatzaileak, eta ez horiek baldintzatuak, h. d. a priori direla, eta horregatik sentsuen engainuetara ez daudela zabalik, orain bakarrik ulertu ahal izan dugu Euklidesen matematika tratatzeko era logikoa arreta onuragabea dela, zango osasuntsuentzako makulu bat dela, ibiltari baten parekoa, zeinek gauez bide argi, finko bat ura delakoan, gorde egiten baitu bere burua hura zapaltzetik eta beti albotik zoru malkarretik baitabil, pozik, tarteka-marteka, ihes egiten dion ur horretan oina ezarriz.