Pleasure and joy are founded on pain; without it they cannot exist. Just like the pleasure of satiety depends on hunger, so do knowledge and joy originate in pain. That is also the reason why, in a tragedy, the sense of an expected redemption fills us with satisfaction. Everything that will have fullness in the future endures states of sadness and pain at present. The knowledge that what is now pain and suffering will in the future turn to plenitude comforts us.
Source (German): Rudolf Steiner – GA 101 – Mythen und Sagen Okkulte Zeichen und Symbole – Berlin, October 28, 1907 (page 96)