Hakadosh Baruch Hu (G-d)
"HaKadosh Boruch Hu" is a title used to refer to the Creator of the world. This title expresses that HaKadosh Boruch Hu is above all comprehension, since the word "kadosh" in Lashon Kodesh means separated and distinct, meaning that we have no comprehension of Him. It is impossible to comprehend the Creator of the world, since comprehension, no matter how broad and deep, can only encompass and understand something that is limited, not One who is unlimited and above the concepts that were given to the intellect to understand.
In Kabbalah and Chassidus[edit | edit source]
In Kabbalah, the term HaKadosh Boruch Hu (and in Aramaic) refers to the revelation of the Ribbono Shel Olam in the worlds through His seven holy middos, which revelation is known as Ze'er Anpin, especially when mentioned together with the word "Shechintei" which refers to the way in which HaKadosh Boruch Hu - Zeir Anpin dwells in His world and conceals Himself in the garments of the worlds called BiYA. However, in Chassidus it is explained that this does not specifically refer to the level called Ze'er Anpin, but to all worlds above the level of the Shechinah which is comprehensible to created beings, and more deeply - to Atzmus U'Mahus.
Atzmus U'Mahus is a term used in Kabbalistic works to refer to the Creator's existence as it is above all definition, positive or negative. The term "Atzmus" refers to the very essence of the Creator as He is above all human comprehension, with complete reservation from any title, and "atzmus" is called "Kadosh" because it is above our comprehension.
The words "Boruch Hu" are a blessing, based on the posuk "The memory of a tzaddik is blessed," which Chazal interpreted as referring to HaKadosh Boruch Hu, the Tzaddik of the world, that when mentioning the Creator's existence, there is an obligation to bless and sanctify Him.