From Jeff Foster:
Be patient with sadness.
Let it come closer, let it engulf you if it must.
Until there is no division between self and sadness.
Until you cannot call it sadness at all.
Until there is only intimacy.
Sadness keeps you soft and flexible.
It reminds you, when you have forgotten,
of the beautiful fragility underneath all things.
In the softness of the heart lies its capacity to love.
Sadness is not the opposite of joy, but its gateway.
See also: Life without a Centre