Goethe

Faust

Though naught was mine, I had enough in youth,
A joy in illusion, a longing for the Truth.
Give back the sweep of surging impulse, re-create
That happiness so steeped in pain,
The power of love, the strength of hate--
O give me back my youth again!
     p.7 Prologue in the Theatre

Joy has its sorrows as sorrows has its joys. p.107 (Mephistopheles)

Mephistopheles:
There is no goal prescribed, however high.
Nibble at everything as you may please,
Snatch at opportunity as you fly;
Whatever gives you joy, I hope agrees;
Only don't be bashful, just fall to.

Faust:
Understand, once and for all—pleasure is not the question!
To poignant joy and tumult I long to yield,
To exhilarating rage, enamored hate.
Nor shall my heart, from thirst of knowledge healed
Henceforth to any sorrow bar the gate.
Deep in my self I will enjoy and find
The fate of which is the lot of humankind;
Within my soul I'll grasp the worst and the best
Heaping their griefs, their joys upon my breast;
This to their selves my own selves I'll extend,
To be destroyed as they are, in the end.
     p.60 Act 4 The Study

"...who are you, then?"
"I am part of that power which eternally wills evil and eternally works good."