The early Christians made it a part of their religion to look for His return.
Backward they looked to the cross and the atonement for sin, and rejoiced in Christ crucified.
Upward they looked to Christ at the right hand of God, and rejoiced in Christ interceding.
Forward they looked to the promised return of their Master, and rejoiced in the thought that they would see Him again. And we ought to do the same.
Taken from Practical Religion.