2 Corinthians 13:14

Finally, believers, rejoice! Be made complete, be comforted, be like-minded, live in peace (enjoy the spiritual well-being experienced by believers who walk closely with God), and the God of love and peace will be with you.  

God, from the beginning, wanted to walk closely and fellowship with us. If we are looking for what completes our lives, it is God. The close relationship with God opens the door for communication and guidance for us and fills the gaps we may have in our hearts.