Halakhah к Дварим 4:35

The foundation of Torah and the pillar of the divine service is to know that there is one God. who is singular and unique, and that He created the Worlds(i.e this world and the next world), and that he is constantly watching us. If, God forbid, he suddenly stopped watching and guiding the world even for a moment, it would revert to chaos and disorder. This is the essence of what is stated: (Deuteronomy 6:4) 'Listen, oh Israel, Hashem, your God, is One'.