Rabbi Nachman of Breslov taught:
Always look for the good
Joy is not incidental to your spiritual quest;
it is vital.
For so it is written (Isaiah 55:12): "You will go out through joy,
and be led forth in peace."
Focus on the good in yourself;
take joy in what is good,
and you will be led forth from inner darkness.
(From Likkutei Mohoran).