sentences:  He did not, for instance, hesitate to eulogize his former friend the great writer and thinker Yosef Haim Brenner, who was an ardent secularist.Zeitlin quoted a wide variety of Hasidic sources, but did not live in a Hasidic community or identify with a particular Hasidic group (although he did visit several prominent Hasidic Rebbes).Zeitlin endeavored to preserve what he called the "treasure" at the core of Hasidic teaching (which he considered to be obscured in his day by pseudo-intellectual trivialities and excessive concern for outward appearance), and to make it accessible not only to Jews of his era but to non-Jews.