We are to recognize that all that comes into being must be ready for a sorrowful end; we are forced to look into the terrors of the individual existence— yet we are not to become rigid with fear: a metaphysical comfort tears us momentarily from the bustle of the transforming figures. We are really for a brief moment Primordial Being itself, feeling its raging desire for existence and joy in existence; the struggle, the pain, the destruction of phenomena, now appear to us as a necessary thing, in view of the surplus of countless forms of existence which force and push one another into life, in view of the exuberant fertility of the universal will. 
We are pierced by the maddening sting of these pains just when we have become, as it were, one with the infinite primordial joy in existence and when we anticipate, in Dionysian ecstasy, the indestructibility and eternity of this joy. In spite of fear and pity, we are happy living beings, not as individuals, but as the one living being, with whose creative joy we are united.

Friedrich Nietzsche - Excerpt from The Birth of Tragedy