Mary Shelley’s Frankenstein is considered by many to be the novel that launched the literary genre of science fiction. Good science fiction often questions the wisdom of scientific advancement. In that vein, many science fiction novels have examined ideas that man might be better off leaving alone (2001 A Space Odyssey springs to mind).
Shelley’s Frankenstein looks at a noble idea (creating life) and shows how such an endeavor might backfire on its creator. Frankenstein’s monster is repugnant to him, and ends up murdering his wife. Dr. Frankenstein thought he knew what he wanted to accomplish, but didn’t visualize what such an accomplishment would really mean.
If I were writing an essay on the danger of knowledge in the novel Frankenstein, my conclusion would focus on how the Shelley's warning still applies today. In fact, with the way technology is advancing at an ever-faster rate, I would argue that her warning is even more important today. Do we really know where all of this communication ability (smartphones, texting, video surveillance, etc.) will take us? Are we more exposed to danger from our enemies through computer hacking? Raising questions like those in your conclusion will leave your reader with something to think about within the context of the points you raise in your essay.
In her introduction to the novel Shelley wrote about a dream she had of a man who created a monster similar to what she wrote about in Frankenstein. This quote is a good indication of her thoughts on the dangers of knowledge:
. . . for supremely frightful would be the effect of any human endeavor to mock the stupendous mechanism of the Creator of the world.
You might consider using this quote in your conclusion.
As you write your conclusion, remember not to simply repeat what you have already written. Don’t say anything about the dangers of modern technology until you get to the conclusion--let that be a shift in perspective offered by your conclusion. Also, don’t introduce new evidence in your conclusion. That is the job of the essay body. And whatever you do, for heaven's sake, don't start out with the words "In conclusion"!