The thinker knows the other because he (re)cognizes him in himself - he is a representation of existence, of life.
The thinker is a hunter of the real - a destroyer of forgetfulness, of lethe. He is the one discovering aletheia.
The other is known more than (s)he can know self, if self is not as self-conscious…if self is not forgotten. He finds the other familiar.
A martyr, as in the Greek μαρτυρας: the witness who experiences an event; the phenomenon being witnessed - it then retains in memory (genetic/memetic code), conjuring it up, at will - remembering, reliving…using/manipulating/exploiting.
Mind as pure observer, detached from what is being witnessed, clarifying the imagery, purifying the memory, the (re)cognition.
Harrison, Thomas wrote:
“Hannibal: I’ve always found the idea of death comforting. The thought that my life could end at any moment frees me to fully appreciate the beauty and art and horror of everything this world has to offer.”
The overman celebrating his victory over his own nature…as temporal becoming.
He no longer resents his nature, his temporal essence, but is comforted by it, because it opens up vistas of perception denied to others.
Existence as an opportunity to see.