Likutei Moharan, Part II 17:1/ליקוטי מוהר"ן·תנינא י״ז:א׳

1A person should be very careful to be joyous and happy on Shabbat. For the advantages and [levels of] holiness of Shabbat are exceptionally great and precious. This is brought [in many places in our sacred literature], especially in Reishit Chokhmah, at the beginning of Shaar HaKedushah (“the Gate of Holiness”). See there.

2It is fitting and right to study the aforementioned section of Reishit Chokhmah, and to pay close attention to everything mentioned there concerning the sanctity and advantages of the holy Shabbat. There are many valuable points about Shabbat’s holiness and advantages, as each topic and advantage mentioned there in connection with Shabbat is itself a separate point. One should understand well [the teaching] there, so that his heart will be inspired to accept Shabbat with great and powerful joy, as is fitting.

3And as a result, fear of God is perfected—i.e., it includes daat. During the week, this fear can include foolishness, as in “Surely, your fear is your foolishness” (Job 4:6). And at the heart of foolishness is the servitude present during the weekdays. Due to the servitude, daat is lacking. This is as it is written about Moab (Jeremiah 48:11), “Moab has been at ease from its youth… and never gone into exile. Therefore, its flavor has remained…”—and as our Sages, of blessed memory, taught (Megillah 12b), for servitude and exile confuse the mind.

4But Shabbat is freedom. And when freedom exists, and servitude and exile do not, then daat is perfected. And the delight and joy of Shabbat are the main way to freedom, as in “Then you will delight in God” (Isaiah 58:14), which is said about Shabbat. And this begets freedom, as in “For through joy you will go out” (ibid. 55:12), because through joy one goes free.

5And when there is freedom, daat is perfected, and so fear of God is as it should be. This is the concept of YaRAi ShaBbaT (Tikkuney Zohar #9, p.24b), when fear of God is without the foolishness present during the week. For the foolishness is primarily on account of servitude, as mentioned above. But through this we raise the “fallen” fears, namely, the fear that we occasionally feel of an official and the like. We elevate these [fears] through daat, which is greatest on Shabbat, when joy produces freedom and daat is consequently perfected, as mentioned above.