Matthew 11:12

11:12 From the days of John the Baptist until now the kingdom of heaven has suffered violence, and forceful people lay hold of it.

Luke 13:24

13:24 “Exert every effort to enter through the narrow door, because many, I tell you, will try to enter and will not be able to.

Ephesians 6:12

6:12 For our struggle is not against flesh and blood, but against the rulers, against the powers, against the world rulers of this darkness, against the spiritual forces of evil in the heavens.

Colossians 1:29

1:29 Toward this goal I also labor, struggling according to his power that powerfully works in me.