Man has explored all countries and all lands, <br />And made his own the secrets of each clime. <br />Now, ere the world has fully reached its prime, <br />The oval earth lies compassed with steel bands, <br />The seas are slaves to ships that touch all strands, <br />And even the haughty elements sublime <br />And bold, yield him their secrets for all time, <br />And speed like lackeys forth at his commands. <br /> <br />Still, though he search from shore to distant shore, <br />And no strange realms, no unlocated plains <br />Are left for his attainment and control, <br />Yet is there one more kingdom to explore. <br />Go, know thyself, O man! there yet remains <br />The undiscovered country of thy soul!<br /><br />Ella Wheeler Wilcox<br /><br />http://www.poemhunter.com/poem/the-undiscovered-country/