5.

"Upon a psaltery of ten strings, with a song, and upon the harp" (ver. 3). Ye have not heard of the psaltery of ten strings for the first time: it signifies the ten commandments of the Law. But we must sing upon that psaltery, and not carry it only. For even the Jews have the Law: but they carry it: they sing not...."And upon the harp." This means, in word and deed; "with a song," in word; "upon the harp," in work. If thou speakest words alone, thou hast, as it were, the song only, and not the harp: if thou workest, and speakest not, thou hast the harp only. On this account both speak well and do well, if thou wouldest have the song together with the harp.