Kabbalah su Amos 4:12

Rabbi Bun also sat and expounded: What is the meaning of the verse (Isaiah 45:7), "I form light and create darkness," Light has substance. Therefore, the term "form" is used with regard to it. Darkness has no substance, and therefore, with regard to it, the term "create" is used. It is similarly written (Amos 4:12), "He who formed the mountains, And created the wind," Another explanation is this: Light was actually brought into existence, as it is written (Gen. 1:3), "God said, let there be light." Something cannot be brought into existence unless it is made. The term "formed" is therefore used. In the case of darkness, however, there was no 'making', only separation and setting aside. It is for this reason that the term "created" (bara) is used. It has the same sense as in the expression, "That person became well (hibri'a)."