Your mind is yours

Receive thy new possessor
—one who brings
A mind not to be changed
by place or time.

The mind is its own place,
and in itself
Can make a Heaven of Hell,
a Hell of Heaven.

What matter where,
if I be still the same.

–Satan,
upon being expelled
from heaven,
in Paradise Lost Book I
John Milton

See also Werner Erhard on the Mind