 There are three different ways in which we can try to establish epistemic instruments. First of all we could regard them as established by mutual coherence. Secondly we could assume that the epistemic instruments justify themselves. We do not have to go beyond perception to realize that perception usually delivers an accurate picture of the world, but perception itself presents a faithful representation of the world and of its own validity. Finally one could regard the epistemic instruments and objects as mutually establishing each other. The instruments establish an object by giving us epistemic access to it. But we could also argue that the epistemic object in turn establishes the epistemic instruments. Given that we manage to interact with the epistemic objects more or less successfully (as confirmed by the evolutionary success of our species) there must be something amongst our cognitive means which gives us a relatively accurate account of the way things are. In this way epistemic success allows us to establish the means of knowledge via the objects successfully cognized.