The quotation beginning with "This intelligence has driven a wedge between me and all the people I once knew and loved" from "Flowers for Algernon" means that Charlie has become estranged from the people he knows since he became a genius. Where once they laughed at him for being ignorant and slow, they now hate him because he's much smarter than them.

Charlie's enhanced intelligence after the operation leads him to painful realizations about his past, causing sadness and shame. He recalls traumatic childhood memories, such as his mother's abuse and his sister's contempt. He also discovers that his coworkers, whom he considered friends, were actually mocking him. This newfound awareness of being bullied and mistreated deepens his emotional distress, as he understands he was used and ridiculed, making his increased intelligence a source of sorrow.

Charlie does not fully understand the temporary nature of his surgery due to his low IQ and limited comprehension skills. In his March 6th diary entry, he fails to grasp the significance of Professor Nemur's warning about the potential temporary and unsuccessful outcomes of the operation. His writing reflects his inability to process complex language and concepts, and his excitement about gaining intelligence overshadows any understanding of the risks involved.

Charlie’s progress reports in "Flowers for Algernon" reflect his increasing intelligence by showing significant changes in his writing style, vocabulary, and depth of thought. Initially, his reports are simple and filled with grammatical errors, but as his intelligence grows, they become more sophisticated, detailed, and introspective, highlighting his intellectual and emotional development.

By the end of "Flowers for Algernon," Charlie gains superior intelligence but loses his innocence and sense of belonging. Initially mentally handicapped, the surgery enhances his cognitive abilities, allowing him to realize the true nature of his relationships and the exploitation by his peers and scientists. Ultimately, as the procedure's effects reverse, he loses the intelligence he gained, leaving him aware of the profound loss and returning him to a dependent state, now keenly aware of what he had and lost.

An IQ score of 68 in "Flowers for Algernon" signifies that Charlie's intelligence is significantly below average, placing him in the lowest 2% of the population. This highlights his intellectual disability before undergoing the experimental surgery to enhance his intelligence. Despite his low IQ, Charlie's motivation to learn is notable, setting him apart from others with similar cognitive limitations and serving as a key element in the narrative's exploration of human potential and self-improvement.

In "Flowers for Algernon," it is crucial for Charlie to record his experiences to monitor his progress during the experiment, which aims to increase his intelligence. As Charlie's cognitive abilities improve, his writings provide a personal account of his transformation and insights into how others treated him. These records are essential for the experiment's data collection, enabling the doctors to document his progress and its eventual decline, forming the basis for their scientific reports.

Charlie loses his knowledge faster than he gained it because the artificially increased intelligence deteriorates at a rate directly proportional to the quantity of the increase. This means that the more intelligence he acquired, the faster he loses it. Charlie's rapid decline highlights the risks of premature human experimentation, as his vast gain in intelligence leads to a swift and painful loss, making him a victim of his own success.