The Christian Life is not easy - and there are many adversaries and obstacles, including one big Adversary. We are to keep watch with necessary vigilance. We are to resist the Evil One, with God's gracious help and provision.

I Peter 5:7-11

Cast all your anxiety on him because he cares for you. Be alert and of sober mind. Your enemy the devil prowls around like a roaring lion looking for someone to devour. 9 Resist him, standing firm in the faith, because you know that the family of believers throughout the world is undergoing the same kind of sufferings. And the God of all grace, who called you to his eternal glory in Christ, after you have suffered a little while, will himself restore you and make you strong, firm and steadfast.

To him be the power for ever and ever.  Amen.