Jewish Mysticism
The righteous, pious, and men of action [mentally] concentrate (mitboded) and unify the great name, blessed be He [YHWH], and stir the fire on the pyre of the hearth chamber in their hearts. Then from the pure thought all the sefirot are unified and bound one to the other, until they are drawn up to the fount of the flame whose sublimity has no end.

Translated by Elliot Wolfson in Through a Speculum that Shines- Vision and Imagination in Medieval Jewish Mysticism, Princeton- Princeton University Press, 1994.