Sorrow and so-called happiness are two side of the one coin. Both are inseparable part of the conditioned human mind. They are great teachers of the meaning and purpose of life, if you are able to use them for learning process. Inevitable nature of impermanence is undeniable. Therefore, one must not loose courage and equilibrium of the mind.

-- 5th Samdhong Rinpoche, Lobsang Tenzin