But the Lord is faithful, and he will strengthen you and protect you from the evil one.
2 Thessalonians 3:3 NIV
The devil is referred to many ways. The deceiver, a prowling lion, father of lies. No mater what you call him there is only one defense against him and that is our heavenly father.
In many cases you never see him coming. He uses deception to get you believing one thing and not the truth. He attacks you were you are vulnerable. He manipulates your loved ones. He is trying to get you to stop believing, loving, seeking, and having faith in the Lord. He will do the most unimaginable things to get to you; anything to get you to lose your faith. Remember Job?
We need to arm ourselves, equip ourselves to be ready for anything. It is not easy, we will fall but we can always get back up. The Lord is our strength. Call to him and he will answer. Amen.