In Kierkegaard's beastly Either/Or, character A. contends that,
“If, then, my thesis is true, a person needs only to ponder how corrupting boredom is for people, tempering his reflections more or less according to his desire to diminish or increase his impetus, and if he wants to press the speed of the motion to the highest point, almost with danger to the locomotive, he needs only to say to himself: Boredom is the root of all evil. It is very curious that boredom, which itself has such a calm and sedate nature, can have such a capacity to initiate motion. The effect that boredom brings about is absolutely magical, but this effect is one not of attraction but of repulsion.”
“If, then, my thesis is true, a person needs only to ponder how corrupting boredom is for people, tempering his reflections more or less according to his desire to diminish or increase his impetus, and if he wants to press the speed of the motion to the highest point, almost with danger to the locomotive, he needs only to say to himself: Boredom is the root of all evil. It is very curious that boredom, which itself has such a calm and sedate nature, can have such a capacity to initiate motion. The effect that boredom brings about is absolutely magical, but this effect is one not of attraction but of repulsion.”