One of the Divine Abodes (brahmaviharas) taught by the Buddha that is often overlooked is that of sympathetic joy (mudita), that feeling of joy for the happiness of others. Ajahn Brahm explains what it is and how to arouse this divine emotion.
Ajahn Brahm gives a teaching on understanding the causes of happy states of mind and how to actively cultivate these states in our meditation practice.
Taken from a talk given during the Oct/Nov 2012 9 Day retreat at Jhana Grove.
Ajahn Brahm teaches us to not expect joy from life, but rather to make joy in life regardless of our present circumstances.