In his poem "If," Kipling explains manly virtues in the manner a father might to a son, and chief among those virtues is perseverance:
"If you can wait and not be tired by waiting" advises the reader to persevere in patience.
"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!'" This is a more literal form of perseverence, one of keeping one's faculties working well into weariness and old age.
"If you can fill the unforgiving minute / With sixty seconds' worth of distance, run." A bit more abstract than his other admonishments, this asks the reader to be ready to strive and persevere, on the shortest of notice, for as long as necessary.
Another related virtue is the ability to distance one's self emotionally from the tasks that might be necessary: "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." He advises us to persevere out of necessity and the satisfaction of being able to do so, not out of some kind of emotional need.