goldstein also produced a collection of source texts for "sefer hamiddot" (the aleph-bet book—a collection of aphorisms on character traits), tracing rebbe nachman's references throughout the bible, talmud and midrash. he also compiled teachings of the baal shem tov and the maggid of mezeritch and their major disciples under the titles "leshon hasidim" and "derekh hasidim".