One has to learn that existence is a dialectic. What appears to be contradictory is not so; it is complementary, it is absolutely necessary. If a man goes on dancing forever, the dance will kill him. If a man goes on singing forever, his song will become a madness. The dance also needs rest, the song also needs rest.
And when you don’t feel any song inside you and you don’t feel any urge to dance – rejoice, that in this emptiness the seeds are growing. And soon there will be songs, far better than you have known before; and soon there will again be dance, far greater than you have even dreamt.
But wait – the key word is to wait, and watch. Once you become aware of the wheel… in the East we have called it the wheel of life and death. The word for the world in the East is jagat, and jagat means wheel – that which goes on moving. One spoke comes up and goes down, another spoke comes up and goes down.
The morning is not only just the beginning of the day, it is also the beginning of the night. The evening is not only the beginning of the night, it is also the beginning of the day.
The moment you understand it, you understand the greatest secret of all.

Zarathustra: A God that Can Dance, Ch 23 (excerpt)