בזאת יבא אהרן אל הקודש (אחרי טז:ג)

Hashem sustains the World in two ways: 1. When everything occurs בדרך הטבע – naturally, and one does not realize that every minute that Hashem runs the world is a miracle. 2. Hashem performs an astonishing miracle where everyone acknowledges that “מאת ה’ היתה זאת” – since it is not a natural occurrence.

This is alluded to in the pasuk. בזאת יבא אהרן אל הקודש” – the word “זאת” the “ז” refers to the seven days of creation, when Hashem created טבע – the natural phenomenon of the World. And the “א & ת” present the miracles that Hashem performs through the letters of the Torah.