We need Him!  There is a longing in every heart, the only difference in people is what we choose to fill that longing with.  And every last thing leaves a bit of emptiness, except when we fill that with God.  Even then we often still feel empty because we are not giving everything to Him.  We still find ourselves becoming anxious, desperate, longing, but at the point where we fully surrender to God, dying to ourselves, we come alive and experience true Joy and fulfillment!