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

Maybe that is why hope reigns eternal, because without which we might know sorrow, we surely cannot delight in joy. For if we cannot see blackness how can we find the light? If the light beckons only from white it is lost in the backdrop of an ethereal existence.
Shall I praise thy name for giving me much space to fill with joy? Praise be! Look - look to thee oh Lord and see thy sorrow has opened a cavern of emptiness. Cannot I, this day, be filled with joy?

Thy will be done, for it is true; we ARE all one under the same sun.