קבלה אויף משלי 2:5

When our teacher Moshe, ascended to the heights, he learned the secret of the mention of the Name HaShem-יהו"ה, blessed is He, from the attendant angels. He warned Israel about this when he said,⁹Deuteronomy 32:3 “When I call in the name of HaShem-יהו"ה, give glory to our God.” Now, if the supernal angels are warned thus about mentioning HaShem’s-יהו"ה name, how much more so are we, who are maggots and worms; certainly, someone foolish enough to make use of his Master’s Crown; how much more so, in our times, when none are proficient in mentioning HaShem’s-יהו"ה Name or its usages in a practical way. This being so, all that will come up in the hand of he who utters it, is the loss of his world and he brings up broken shards in his palms. About such a one the rabbis said,¹⁰Talmud Bavli, Chagigah 11b “Whosoever does not consider the honor of his Master is better off never having come into the world.”

What you learn from this is that when you will understand the meaning of the holy names according to their families, and comprehend the titles associated with each of them, you then will see that everything depends on His Great Name HaShem-יהו"ה, blessed is He, and you will yearn and desire to adhere to Him and will be in awe and fear of Him. Then you will understand the fear of HaShem-יהו"ה and will discover knowledge of God-אלהי"ם,²⁷Proverbs 2:5 and you will enter amongst those about whom it says,²⁸Psalms 91:15 “I will uplift him for he knows My Name.” You then will understand how great is the punishment of someone who mentions the name of heaven in vain; how much more so, someone who pronounces the name according to its letters; even more so, someone who makes use of it! Now, before I begin with the intent of this composition, I must first preface as follows;