The realized man is awake in the light of the Self, while the ignorant is awake in the light of the senses. The realized man is awake in the light of absolute bliss, the ignorant in the light of relative joys of a perishable nature.

~ Maharishi Mahesh Yogi
[Commentary on Bhagavad Gita, Ch2, V69]

The deeper that sorrow carves into your being, the more joy you can contain.

~ Kahlil Gibran

True happiness is uncaused and this cannot
disappear for lack of stimulation. It is not
the opposite of sorrow, it includes all sorrow
and suffering.

- Nisargadatta Maharaj