1 Peter 5:8-9:

Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour [gulp down]:
Whom resist stedfast in the faith, knowing that the same afflictions are accomplished in your brethren that are in the world.

Notes on 1 Peter 5:8-9:

The devil is looking for whom he may devour, which shows you that the devil can’t just go devour someone.  He can’t devour those who resist him steadfastly in faith.  He will try various subtle plots to destroy you, but you can avoid being tricked and devoured by staying in fellowship with God and by knowing His Word.

See also:

How NOT to Deal with the Devil

Casting Out the Spirit of Stupidity

If You Blow It

Who Is in Control of Your Life?

Job Explained

Healing and Effort

Am I Sick Because I Left a Door Open to the Devil?

Does a Serious Sickness Attack Prove That a Major Breakthrough Is Just Ahead?

Can a Christian Have a Demon?

Objection: God Has Satan on a Leash and Only Permits Him to Do Certain Things to You

Objection: Jesus Now Has ALL Authority, So If Satan Afflicts You, He Has to Get Jesus’ Permission First

Objection: God Sometimes Heals You Only After He Has Let You Suffer a While (1 Peter 5:10)

Objection: God Gives and Takes Away
Objection: In the Lord’s Prayer, We Are Supposed to ASK GOD to Deliver Us from Evil, not “Claim” Deliverance from It