With great power, comes great responsibility. You may scoff at a line from a comic book, but the origin of the words bears nothing upon their meaning. It is true -- great power, used responsibly, can cure the ills of humanity. Used inappropriately, or with caprice, such power can sow darkness, despair, and destruction. There is no greater power than our own minds, the engine that drives us. Within the electrochemical workings of our synapses lie the ability to turn our knowledge into power, and that power into action. If we do not think, do not apply our knowledge to a task, or wield our knowledge loosely, we stand to make bad situations worse, and horrible situation catastrophic.
Victor Frankenstein found this out, when he took his knowledge of life and matter, and sought to imbue dead flesh with life once more, strapping together a new human being from parts of old human beings. The import of this was lost on him, so mad was he with the desire to see his knowledge writ large across history as the man who defied death's grip. He did not see the bigger picture, did nothing to enfold the greater sum of humanity into the the equation. He simply brought his creation to life, and thus his grisly jigsaw puzzle of humanity was born of madness and electricity, and would eventually turn out to be his death in the Arctic wastes. His irresponsibility caught up with him.
Mary Shelley's cautionary tale, and Stan Lee's words of wisdom, stand testimony to that which humanity cannot ever seem to come to grips with, truly: what we do, and how we do it, returns to us in the end. If we do not think ahead, we will find ourselves in pursuit of our own monster, loosed upon the world through our oversight.