This, then, is an absolutely necessary requirement, and what it pre-supposes is not merely justified as an allowable hypothesis, but as a postulate in a practical point of view;
Beraz, hori premia bat da guztiz beharrezkoa den ikuspegian, eta bere aurresuposizioa legeztatzen du ez soilik hipotesi onartu gisa, baizik postulatu gisa asmo praktikoan;