For a long time, the Sephardim took an active part in Spanish literature; they wrote in prose and in rhyme, and were the authors of theological, philosophical, (aesthetic rather than content-based writing), pedagogic (teaching), and mathematical works. The rabbis, who, in common with all the Sephardim, emphasized a pure and euphonious pronunciation of Hebrew, delivered their sermons in Spanish or in Portuguese. Several of these sermons have appeared in print. Their thirst for knowledge, together with the fact that they associated freely with the outer world, led the Sephardim to establish new educational systems. Wherever they settled, they founded schools that used Spanish as the medium of instruction.