Psalm 87:17 Shew me a token for good; that they which hate me may see it, and be ashamed: because thou, LORD, hast holpen me, and comforted me.
David asks that God do something just so those that hate him and what he stands for will be ashamed. People do not believe in God. They do not believe that He really hears and answers our prayers. David wanted God to show His hand so that all would know just how real and power His God was and is!
Live a life that shows God and His power. Be a person of prayer! Seek God and when He does something always magnify Him!