The variations of science depend upon the variations of human needs, and men of science are wont to work, willingly or unwillingly, wittingly or unwittingly, in the service of the powerful or in that of a people that demands from them the confirmation of its own desires.
Zientziaren aldaketak giza premien aldaketen arauerakoak izaten dira, eta zientzi gizonek, nahita edo nahi gabe ere, dakitela edo ez dakitelarik, boteretsuen alde edo beren irriken berrespena eskatzen dien herriaren alde egiten dute lan.