Man ignores this spiritual Reality within him and seeks satisfaction in the outer world.
As St. Augustine wrote so many years ago :
“ Men go abroad to wonder at the height of the mountains, the lofty billows of the sea, the long courses of rivers, the vast compass of the ocean and the circular motion of the stars, and yet pass themselves by.”
No matter how far man goes in demonstrating his mastery over the outer world, his soul will remain unsatisfied so long as he ignores the spiritual side of his nature. Permanent peace and satisfaction are only to be found by discovering the nature of his own real Self.
This is what the saints and mystics of all ages have taught, and their message is as true to-day in an age dominated by science and technology as it was in the age of the Upanishads.