@de Silentio,
Sorry, I guess I am not one of the non-philosophical comrades, so I am unable to dissociate this sentence from Wittgenstein's Tractatus.
What Wittgenstein meant is ultimately quite mysterious.
I believe it was intended as the ultimate sign-off.
It's quite possible that he thought that this was going to become the final sentence of the Western Philosophy...
We can speculate endlessly about that, the secret lies with Wittgenstein.
On the other hand, I wonder why JG has chosen that - I wonder about how he interprets that. He is quite fond of Nietzsche, I guess (check out his icon), not to mention that he is also truly competent about him.
The funny thing is that, I guess, N. never conceived he could have possibly remained silent about anything... never.