Tanya for the 14th of Sivan, י׳׳ד סיון

Just as this attribute, which is responsible for the creation, is unfathomable, so, too, with regard to the attribute of gevurah, or “contraction.” The function of this attribute is to conceal from created beings the activating force within them, enabling them to exist as tangible entities instead of being utterly nullified within their source.