by Rudyard Kipling (1865-1936)

If you can keep your head when all about you
   Are losing theirs and blaming it on you;
If you can trust yourself when all men doubt you,
   But make allowance for their doubting too;
If you can wait and not be tired by waiting,
   Or, being lied about, don’t deal in lies,
Or, being hated, don’t give way to hating,
   And yet don’t look too good, nor talk too wise;

If you can dream—and not make dreams your master;
   If you can think—and not make thoughts your aim;
If you can meet with triumph and disaster
   And treat those two impostors just the same;
If you can bear to hear the truth you’ve spoken
   Twisted by knaves to make a trap for fools,
Or watch the things you gave your life to broken,
   And stoop and build ’em up with wornout tools;

If you can make one heap of all your winnings
   And risk it on one turn of pitch-and-toss,
And lose, and start again at your beginnings
   And never breathe a word about your loss;
If you can force your heart and nerve and sinew
   To serve your turn long after they are gone,
And so hold on when there is nothing in you
   Except the Will which says to them: “Hold on”;

If you can talk with crowds and keep your virtue,
   Or walk with kings—nor lose the common touch;
If neither foes nor loving friends can hurt you;
   If all men count with you, but none too much;
If you can fill the unforgiving minute
With sixty seconds’ worth of distance run—
   Yours is the Earth and everything that’s in it,
And—which is more—you’ll be a Man, my son!

Update in 2019: Kipling in America

Kipling has been variously labelled a colonialist, a jingoist, a racist, an anti-Semite, a misogynist, a right-wing imperialist warmonger; and—though some scholars have argued that his views were more complicated than he is given credit for—to some degree he really was all those things. That he was also a prodigiously gifted writer who created works of inarguable greatness hardly matters anymore, at least not in many classrooms, where Kipling remains politically toxic.

[…]

Kipling was profoundly altered by his experience of America, and that America, in turn, was altered by its experience of Kipling. But you could also make a case that neither was changed enough. Kipling never learned to lighten up—or to appreciate American humor and informality—and America, by his lights, never got over being headstrong and overly sure of itself.