It seldom happens that any felicity comes so pure as not to be tempered and allayed by some mixture of sorrow.

It seldom happens that any felicity comes so pure as not to be tempered and allayed by some mixture of sorrow.

很少有一种幸福来得如此纯洁，以至于不被某种混合的悲伤所调和和减轻。

-- Miguel de Cervantes 塞万提斯