"It is said with good reason that convictions have no civic rights in the domain of science: it is only when a conviction voluntarily condescends to the modesty of an hypothesis, a preliminary standpoint for experiment, or a regulative fiction, that its access to the realm of knowledge, and a certain value therein, can be conceded,—always, however, with the restriction that it must remain under police supervision, under the police of our distrust.—Regarded more accurately, however, does not this imply that only when a conviction ceases to be a conviction can it obtain admission into science? Does not the discipline of the scientific spirit just commence when one no longer harbours any conviction?... It is probably so: only, it remains to be asked whether, in order that this discipline may commence, it is not necessary that there should already be a conviction, and in fact one so imperative and absolute, that it makes a sacrifice of all other convictions. One sees that science also rests on a belief: there is no science at all "without premises." The question whether truth is necessary, must not merely be affirmed beforehand, but must be affirmed to such an extent that the principle, belief, or conviction finds expression, that "there is nothing more necessary than truth, and in comparison with it everything else has only a secondary value."—This absolute will to truth: what is it? Is it the will not to allow ourselves to be deceived?"