Because
Psalm 54:3,4 For strangers are risen up against me, and oppressors seek after my soul: they have not set God before them. Selah...
therefore
Psalm 5:11 But let all those that put their trust in you rejoice: let them ever shout for joy, because you defend them...
Psalm 21:1 The king shall joy in your strength, O LORD; and in your salvation how greatly shall he rejoice!
Psalm 57:1 Be merciful to me, O God, be merciful to me: for my soul trusts in you: yes, in the shadow of your wings will I make my refuge...
Psalm 61:4 I will abide in your tabernacle for ever: I will trust in the covert of your wings. Selah.
1 Samuel 17:37 David said moreover, The LORD that delivered me out of the paw of the lion, and out of the paw of the bear...
2 Corinthians 1:10 Who delivered us from so great a death, and does deliver: in whom we trust that he will yet deliver us;