Likutei Moharan 27:4/ליקוטי מוהר"ן כ״ז:ד׳

14 . Commensurate with the refining of his wisdom by these Thirteen Principles, is the refinement of the voice of his song. This is as in: An elder is one who has KaNaH (acquired) wisdom (Kiddushin 32b). The KaNeH (windpipe) emits the voice. {“Let Me see your countenance, let Me hear your voice” (Song of Songs 2:14). }

2This is the meaning of: “Let Me see your countenance”—this is the concept of a majestic countenance, the elder, as explained. “Let Me hear your voice”—for the voice is in accordance with the wisdom of the Torah expositions, in accordance with the intellect of the Thirteen Principles through which he DoReSh (expounds) the Torah. And this is (Amos 5:4), “DiRShuni (seek Me) and live,” for “Wisdom gives life to the one who possesses it” (Ecclesiastes 7:12).