This means that reality as image is based upon knowledge which has to be result of scientific theoretical reasoning and thorough research.
Nothing is accepted as correct and true without a reliable scientific background.
One is obliged to substantiate all his claims. If one succeeds to do so people are willing to accept the offered knowledge. Then they believe that the facts and the theories are correct and in that case they speak about 'belief' and 'faith'. In fact it has nothing to do with these notions. It will be obvious that it isn't a matter of a corresponding insight in reality, as is the case with the notions 'belief' and 'faith'.