Epiphany-tide: "We know that we belong to God"

We know that we belong to God,
and the whole world is under the power of the Evil One.
We also know that the Son of God has come
and has given us discernment to know the one who is true.

-- 1 John 5: 14-21

This dramatic situation of "the whole world [which] is in the power of the evil one"makes man's life a battle:

The whole of man's history has been the story of dour combat with the powers of evil, stretching, so our Lord tells us, from the very dawn of history until the last day. Finding himself in the midst of the battlefield man has to struggle to do what is right, and it is at great cost to himself, and aided by God's grace, that he succeeds in achieving his own inner integrity.

-- CCC 409