Shulchan Aruch:
“tzivu chaza”l shelo yilmad adam es bito torah mipnei sherov hanashim ein da’atan michuvanos l’hislamed u’motzios divrei torah l’divrei havai l’phi anius da’atan, amru chaza”l kol hamilamed es bito torah k’ilu milamda tiflus bameh divorim amurim torah she’bal peh, aval torah she’bicsav…”.
simcha: Which part “is not clear”?