My Dear Child,
The brain is a very important part of the body. It reaches its largest size at 10 years of age, but is fully formed until the age of 25. The brain uses energy to perform different actions each day, so it needs you to have enough water in your body, in order to fulfill those tasks. In the brain, we find millions of neurons, which help to perform every task, whether movement, learning or concentration. Even when you sleep, your brain is still active, and its storage capacity is unlimited. God gave you a wonderful brain and wants you to use it to learn only good things, because He is good and desires the best for you.
“Such knowledge is too wonderful for me.” Psalm 139:6