 The blending of scientific and religious issues is evident from the beginning in the encyclopedia. Sciences should be the main topic in the first and the second sections and, partially, in the third, and theology in the rest of the corpus. In spite of the fact that ancient texts are always quoted with great accuracy from a philological point of view, the Ikhwân deeply rework the Greek sources in line with their goals that are completely different from those of the ancients. Thus religion should not be underestimated in order to attain the best comprehension of its various contents and real aims.