Weber's self-conscious acceptance of the value of scientific rationality is expressed in the assertion that science is an absolutely unique source of knowledge, and the one "for whom scientific truth is of no value will seek in vain for some other truth to take the place of science in just those respects in which it is unique …" (OSS, 110 ff.). Weber sees scientific truth as being a unique source of knowledge insofar as it offers "the provision of concepts and judgments which are neither empirical reality nor reproductions of it but which facilitate its analytical ordering in a valid manner" (OSS, 111). In asserting that scientific rationality is a unique source of knowledge that is intimately tied with progress and that such knowledge is worth having, Weber is very much a part of the Enlightenment tradition.