"Scripture commands us to rejoice in the Lord. That's not just a pious way of saying, "Be happy in a Christian way." Rather, it's telling us the secret to joy: joy comes from our relationship with God, who Himself is omni-joyful! The key to moving from self-pity to genuine joy is not thinking happy thoughts; it's thinking of and fellowshipping with Christ!"
from Day 3 in Gospel Meditations for Women
by Joe Tyrpak and Chris Anderson