Salt and light

"First salt, then light, so that you may learn how profitable sharp words [(τῶν κατεστυμμένων ῥημάτων)] may be and how useful serious doctrine [(τῆς σεμνῆς διδασκαλίας)]."

     St. John Chrysostom, Homily 15 on Matthew, as trans. Liturgy of the hours (Universalis).  =Homiliae in Matthaevm, ed. Field (1839), vol. 1, p. 201 at 195A =PG 57, col. 232.  NPNF:

"And before they are salt, and now light; to teach thee how great [(ἡλίκον)] is the gain of these strict precepts, and the profit of that grave discipline: . . ."