Quote by Source Unknown
The brain is the only part of the human machine that doesn't wear out. Probably it's because the brain is the only part that is not overworked.
Summary
This quote suggests that the brain, unlike other parts of the human body, doesn't deteriorate over time because it is not overworked. While other organs may wear out due to constant use and strain, the brain remains resilient because it is not subjected to physical exhaustion. This may imply that the brain has a unique capacity for enduring and adapting to mental challenges throughout one's lifespan.