The prose passage in Katha Upanishad continues as follows:
“The Self has made his doors outward, therefore man sees outward and not in the inner self.
Only a wise man turns his eyes inward, desiring immortality and looks on the Self face to face.
The child minds follow after surface desires and fall into the net of death.
The wise man comes to know the great Lord and Self by whom one sees all that is in the soul that wakes and all that is in the soul that dreams and has grief no longer.
The infinite Mother resides within the secret cavern of being of all creatures.
This is the Fire that has knowledge and is hidden just as an embryo is borne in pregnant women. This is the Fire to which offering has to be made.
A Purusha no bigger than a thumb stands in man’s central self and is the lord of what was and what shall be and knowing him one shrinks from nothing that is.
A Purusha no bigger than a man’s thumb and he is like a light without smoke. It is he that is today and it is he that shall be tomorrow.”