Likutei Moharan, Part II 66:2/ליקוטי מוהר"ן·תנינא ס״ו:ב׳

12. This is as the masters of musar (ethics) teach: When a person comes to the tzaddik and sees him, as in “and your eyes will see your teacher” (Isaiah 30:20), it is right that he find himself within the tzaddik. Seeing the tzaddik’s face will lead to introspection, to see where he stands in the various facets of his character.

2This is because all character traits stem from the aforementioned four elements, as is brought. Therefore, when he sees the tzaddik, who is the concept of the simple element, from which the four elements are drawn, he ought to examine and sense where he stands in the various character traits. For they come from the four yesodot, which stem from the tzaddik, namely, the concept of the simple yesod .

3Thus, the first letters of “and then Ainekha Ro’ot Et Morekha (your eyes will see your teacher)” are an acronym for Eish Ruach Mayin Ahfar . These are the four yesodot from which all the traits stem, for they all stem from the tzaddik. Therefore, when a person sees the tzaddik—i.e., the concept of “and then your eyes will see your teacher”—he looks within, to see where he stands in the various character traits, which come from the four elements—fire, air, water, earth—which are derived from the tzaddik, as mentioned above.