The philosopher Kant observes that a dove, inasmuch as the only obstacle it has to overcome is the resistance of the air, might suppose that if only the air were out of the way it could fly with greater rapidity and ease. Yet if the air were withdrawn, and the bird should try to fly in a vacuum, it would fall instantly to the ground unable to fly at all. The very element that offers the opposition to flying is at the same time the condition of any flight whatever.

Rough seas and storms make sailors. Emergencies make giant men. But for our Civil War the names of its grand heroes would not be written among the greatest of our time.

The effort or struggle to climb to a higher place in life has strength and dignity in it, and cannot fail to leave us stronger for the struggle, even though we miss the prize.

From an aimless, idle, and useless brain, emergencies often call out powers and virtues before unknown and suspected. How often we see a young man develop astounding ability and energy after the death of a parent, or the loss of a fortune, or after some other calamity has knocked the props and crutches from under him. The prison has roused the slumbering fire in many a noble mind. "Robinson Crusoe" was written in prison. The "Pilgrim's Progress" appeared in Bedford Jail. The "Life and Times" of Baxter, Eliot's "Monarchia of Man," and Penn's "No Cross, No Crown," were written by prisoners. Sir Walter Raleigh wrote "The History of the World" during his imprisonment of thirteen years. Luther translated the Bible while confined in the Castle of Wartburg. For twenty years Dante worked in exile, and even under sentence of death. His works were burned in public after his death; but genius will not burn.

Take two acorns from the same tree, as nearly alike as possible; plant one on a hill by itself, and the other in the dense forest, and watch them grow. The oak standing alone is exposed to every storm. Its roots reach out in every direction, clutching the rocks and piercing deep into the earth. Every rootlet lends itself to steady the growing giant, as if in anticipation of fierce conflict with the elements. Sometimes its upward growth seems checked for years, but all the while it has been expending its energy in pushing a root across a large rock to gain a firmer anchorage. Then it shoots proudly aloft again, prepared to defy the hurricane. The gales which sport so rudely with its wide branches find more than their match, and only serve still further to toughen every minutest fibre from pith to bark.

The acorn planted in the deep forest shoots up a weak, slender sapling. Shielded by its neighbors, it feels no need of spreading its roots far and wide for support.

Take two boys, as nearly alike as possible. Place one in the country away from the hothouse culture and refinements of the city, with only the district school, the Sunday-school, and a few books. Remove wealth and props of every kind; and, if he has the right kind of material in him, he will thrive. Every obstacle overcome lends him strength for the next conflict. If he falls, he rises with more determination than before. Like a rubber ball, the harder the obstacle he meets the higher he rebounds. Obstacles and opposition are but apparatus of the gymnasium in which the fibres of his manhood are developed. He compels respect and recognition from those who have ridiculed his poverty. Put the other boy in a Vanderbilt family. Give him French and German nurses; gratify every wish. Place him under the tutelage of great masters and send him to Harvard. Give him thousands a year for spending money, and let him travel extensively.

The two meet. The city lad is ashamed of his country brother. The plain, threadbare clothes, hard hands, tawny face, and awkward manner of the country boy make sorry contrast with the genteel appearance of the other. The poor boy bemoans his hard lot, regrets that he has "no chance in life," and envies the city youth. He thinks that it is a cruel Providence that places such a wide gulf between them. They meet again as men, but how changed! It is as easy to distinguish the sturdy, self-made man from the one who has been propped up all his life by wealth, position, and family influence, as it is for the shipbuilder to tell the difference between the plank from the rugged mountain oak and one from the sapling of the forest. If you think there is no difference, place each plank in the bottom of a ship, and test them in a hurricane at sea.

When God wants to educate a man, he does not send him to school to the Graces, but to the Necessities. Through the pit and the dungeon Joseph came to a throne. We are not conscious of the mighty cravings of our half divine humanity; we are not aware of the god within us until some chasm yawns which must be filled, or till the rending asunder of our affections forces us to become conscious of a need. Paul in his Roman cell; John Huss led to the stake at Constance; Tyndale dying in his prison at Amsterdam; Milton, amid the incipient earthquake throes of revolution, teaching two little boys in Aldgate Street; David Livingstone, worn to a shadow, dying in a negro hut in Central Africa, alone,—what failures they might all to themselves have seemed to be, yet what mighty purposes was God working out by their apparent humiliations!

Two highwaymen chancing once to pass a gibbet, one of them exclaimed: "What a fine profession ours would be if there were no gibbets!" "Tut, you blockhead," replied the other, "gibbets are the making of us; for, if there were no gibbets, every one would be a highwayman." Just so with every art, trade, or pursuit; it is the difficulties that scare and keep out unworthy competitors.