'Of This World' in the Bible

You practiced such things when you lived according to the evil ways of this world, and according to the ruler of the [spiritual] powers of the air. [Note: This refers to Satan, whose influence permeates life around us]. He is the [evil] spirit who is now at work in people who are disobedient [to God].

For our struggle is not [actually] against human beings, but against rulers and authorities and leaders of this world's darkness, and against the spiritual forces of evil in the heavenly realms. [Note: "Heavenly realms" here refers to the struggle against Satanic powers which permeates life around us].