What you judge as joy or sorrow is only like a passing cloud, which cannot affect the splendor of the Sun or Moon.  Know that such emotions follow one another when the wheel of life turns round from moment to moment.  The sea has water that cannot quench thirst, but it has also pearl and coral.  You have to get toughened by the hammer strokes of joy and sorrow until you are unaffected by the vicissitudes of fortune.  The Atman (Self) alone is eternal and unchanging.

-Divine Discourse, Vol 13 Ch 19, Nov 23, 1975.

Love must express itself as service. - Baba