I would interpret this as the third option, and I would also disagree. You can manipulate others to want things/you and you can manipulate yourself, it isn't even that difficult. You can distract yourself at a critical moment for example (this works well when you are about to punch someone.) And then you won't need to anymore because the surge of anger is gone, although you might need to for other reasons.
The fourth is false as an interpretation, it isn't consistent with the sentence and I don't think it is what he meant to express either, the fourth would in fact be willing as you will. Whether he said it has no bearing on whether it is true though.
The first is trivially true, though false as a reading.
The second is the real bait, free will.
Followup to: Possibility and Could-ness
Arthur Schopenhauer (1788-1860) said:
For this fascinating sentence, I immediately saw two interpretations; and then, after some further thought, two more interpretations.
On the first interpretation, Schopenhauer forbids us to build circular causal models of human psychology. The explanation for someone's current will cannot be their current will - though it can include their past will.
On the second interpretation, the sentence says that alternate choices are not reachable - that we couldn't have taken other options even "if we had wanted to do so".
On the third interpretation, the sentence says that we cannot control our own desires - that we are the prisoners of our own passions, even when we struggle against them.
On the fourth interpretation, the sentence says that we cannot control our own desires, because our desires themselves will determine which desires we want, and so protect themselves.
I count two true interpretations and two false interpretations. How about you?