Light At The End Of The Tunnel Meaning

(idiomatic) A better situation after long hardship.

Example: 1999, Abraham J Twerski, It's Not As Tough As You Think: How to Smooth Out Life's Bumps
  If there is no light at the end of the tunnel, chronic pain can render a person dysfunctional. In desperation, people often turn to potent pain-killing medication for relief.
2008, CIO magazine (volume 21, number 7, 15 January 2008)
  But by fall 2005, there was light at the end of the tunnel. The team could see the new business processes and financial data governance mechanisms actually being used by Nationwide employees.