Of the different prayer requests in the Bible one of the most often prayed and one that God commands us to pray often is asking God to protect us from our enemies, and the primary enemy that we have is the devil and his demons. Here is one of many passages in the Bible that describes his attempts at destroying us. His goal is to make us miserable and to draw us away from loving God, and with many today he is succeeding.

Psalms 10:8-10
He sits in the lurking places of the villages;
In the hiding places he kills the innocent;
His eyes stealthily watch for the unfortunate.
He lurks in a hiding place as a lion in his lair;
He lurks to catch the afflicted;
He catches the afflicted when he draws him into his net.
He crouches, he bows down,
And the unfortunate fall by his mighty ones.

When you feel discouraged, worthless, like a failure, unmotivated, tempted, bitter, like a loser, anxious, or sad consider the fact that it very well could be demons that are talking to you, and pray asking God to crush them.

Psalms 17:11-13
They have now surrounded us in our steps;
They set their eyes to cast us down to the ground.
He is like a lion that is eager to tear,
And as a young lion lurking in hiding places.
Arise, O Lord, confront him, bring him low;
Deliver my soul from the wicked with Your sword,

Psalms 17:6-9 I have called upon You, for You will answer me, O God;
Incline Your ear to me, hear my speech.
Wondrously show Your lovingkindness,
O Savior of those who take refuge at Your right hand
From those who rise up against them.
Keep me as the apple of the eye;
Hide me in the shadow of Your wings
From the wicked who despoil me,
My deadly enemies who surround me.

God protects, He gives Peace, He gives joy, but only to those who give Him time in prayer.