A person cannot be tamed.
A thirst for freedom cannot be extinguished.
Such is the main theme of an almost unknown to the modern domestic reader, but once extraordinarily popular, science fiction novel by Jack London, whose hero, declared mad, in reality possesses a remarkable power of will: to leave his physical body and wander through the most distant epochs and countries.
He doesn’t need a time machine—he is the time machine.
Flesh may languish behind bars—but what does it matter if the mind and spirit are free?.