Likutei Moharan 135:1/ליקוטי מוהר"ן קל״ה:א׳

1“Ki Ekach Mo’ed (When I seize the appointed time), I will judge with equity.” (Psalms 75:3)

2Aparticularly propitious method for being spared from haughtiness is to honor the festivals, and welcome [each] festival with joy and with as many delights as one can afford.

3Moshe Rabbeinu, of blessed memory, by meriting to the Forty-Nine Gates of Wisdom, was worthy of being “extremely humble, more so than any man” (Numbers 12:3). Now, yom tov (festival) [corresponds to] the mentalities of Imma, which is Binah (Understanding). Therefore, when one welcomes the festival, which is Binah, one merits humility. For yom tov is numerically equivalent to SaG plus its ten letters, as is brought in the Kavanot—the reverse of a GaS (haughty) spirit.

4The festival eliminates haughtiness because it is the nature of the lesser to be nullified vis-à-vis the greater. Consequently, when one is close to the tzaddik, haughtiness is eliminated; for due to the great light of the tzaddik he is completely nullified. This corresponds to (Job 29:8), “The youths saw me and hid”—because they see the face of the tzaddik, the little ones hide. For the lesser becomes nullified before the greater.

5Now, in the main, the power of the festival’s holiness is contingent upon the tzaddikim, as it is written (Leviticus 23:4), “These are God’s festivals… that you must proclaim otam (them) at their appointed times.” Our Sages expounded: Do not read OTaM but ATeM (you) (Rosh HaShanah 24a).

6We find therefore that the festivals are dependent upon the tzaddikim.

7Thus, when one welcomes and honors the festivals, and receives the great light of yom tov, which is the aspect of tzaddik, his haughtiness is eliminated. For the lesser is nullified vis-à-vis the greater. Because of this, a man is obliged to visit his rabbi on the festival, since the primary power of yom tov is contingent upon the tzaddikim.