Let's start with this passage.

1 Peter 5:6-8:

Therefore humble yourselves under the mighty hand of God, that He may exalt you at the proper time, casting all your anxiety on Him, because He cares for you. Be of sober spirit, be on the alert. Your adversary, the devil, prowls around like a roaring lion, seeking someone to devour.

What happens if you are not on the alert, and turn your back on a lion or other large cat? Check out this video:

Brings a bit of new perspective to this verse, does it not?

1 Peter 5:8:

Be of sober spirit, be on the alert. Your adversary, the devil, prowls around like a roaring lion, seeking someone to devour.

Of course that is not the end of the passage:

1 Peter 5:9-11

But resist him, firm in your faith, knowing that the same experiences of suffering are being accomplished by your brethren who are in the world. After you have suffered for a little while, the God of all grace, who called you to His eternal glory in Christ, will Himself perfect, confirm, strengthen and establish you. To Him be dominion forever and ever. Amen.