Musar su Salmi 89:8

And behold that the principle behind all of the punishments mentioned in this level is because of profaning the Torah. And our Rabbis, may their memory be blessed, said (Yerushalmi Nedarim 3:14), that the sin of profanation is bigger than all of the transgressions. And it is not possible to atone [for it] with repentance and afflictions, as will be explained in the Gate of the Parts of Atonement (no longer extant). And our Rabbis, may their memory be blessed, said (Kiddushin 40a), “There is no [deferral] with [the punishment] for profaning [God’s] name - whether one is inadvertent or volitional.” And now stand and reflect upon our great obligation to sanctify His name: As the essence of that which God, may He be blessed, sanctified us with His Torah and His commandments and separated us to be [a people] for Him was to sanctify Him and to fear Him. [Hence] it is fit from the ones he sanctified to be holy - in that even the vessels [used to] serve in front of God, may He be blessed, need to be sanctified; as it is stated (Leviticus 22:32), “You shall not profane My holy name, that I may be sanctified in the midst of the Israelite people; I am the Lord who sanctified you,” Note and understand that the matter that we said can be found explicitly in this verse: It is stated (Psalms 111:9), “He ordered His covenant for all time; His name is holy and awesome.” Its explanation is, because “His name is holy and awesome,” “He ordered His Covenant for all time” and commanded us with His commandments - to sanctify Him and to fear Him. Hence, it is written after it (Psalms 111:10), “The beginning of wisdom is the fear of the Lord; sound understanding, etc.” And through the holiness of the commandments - when we sanctify God, may He be blessed, we are associated with the supernal holy ones that sanctify and venerate Him, as it is stated (Psalms 89:8), “A God venerated in the great council of holy beings, etc.”

When he contemplates all of this, it will be impossible for his heart to not fear and for him to not quiver while he speaks his words before Him, blessed be He, and utters His Name, and strives to find His favor. This is what scripture says: "Serve G-d with fear, and rejoice in trembling" (Tehilim 2:11), and "G-d is revered in the great council of the holy ones and feared by all around Him"(Tehilim 89:8).

Likewise our sages, of blessed memory, said regarding the Levites: "because they knew that whoever carries the Ark merits great reward, they abandoned the Shulchan, Menorah and Altars, and all ran to the Ark to gain reward. Then, this person argued saying 'I will carry it from here' and that person argued saying 'I will carry it from here' until they came to lightheadedness and the Divine presence would hit them..." (Midrash Raba 5:1).