I've been asked, off-list, whether, in my view, Parsifal "gives" in the course of the opera (to go with his "sympathizing" and self- "control", for TWL purposes.)
In brief, I would say the answer is "yes": Parsifal not only "gives", but he that which he gives is meant to be understood as having unparalled value.
Parsifal concludes the opera by "giving" the "Holy Spear" (used at Christ's crucifixion, which alone can heal the wound of Amfortas), to the Grail Knights, from whom it had been stolen by Klingsor. ("I have borne it beside me and now bring it home, gleaning clean and bright before you, the holy Spear of the Grail.")
After healing Amfortas with the Spear, Parsifal provides another "gift": he performs the "Holy Office" that Amfortas, in his sin and suffering, had been unable or unwilling to perform, and the absence of which had brought the Order to the edge of ruin (and brought death to Amfortas' father.)
Parsifal's final speech beings:
"But one weapon serves:
only the Spear that smote you [Amfortas]
can heal your wound.
Be whole, absolved and atoned!
For I now will perform your task.
O blessed be your suffering,
that gave pity's mighty power
and purest wisdom's might
to the timerous fool. [Parsifal himself]
I bring back to you
the holy Spear!"
The two "gifts" of the Spear and perfomance of the Holy Office are of course related, and both are tied to the "gift" of salvation, which Parsifal, presumably, cannot himself bring. (Although this limit is not entirely clear: some orthodox religious people have condemned the work as blasphemous, believing the ties between Parsifal and Christ to be too close.)
Also worth noting that, in the portion quoted above, Parsifal identifies Amfortas' suffering, and his own empathy with it, as having given Parsifal the wisdom necessary to realize his mission.
Beyond that, I'll say no more, since Parsifal is subject to many interpretations and I've probably already imposed meanings that others might not find in the text.
Finally, as it was suggested that I address this on-list, I assume there's no objection to my identifying the interrogator as the inimitable Rick Parker. Thanks for shaking me out of my torpor, Rick.