Now, you've all heard of Braille, the deaf alphabet, and you might have also heard that it was invented by Louis Braille, who was blind. He was fifteen years old when he came up with the clever system of raised dots that enables blind people to read and write. Louis taught this system to his classmates at the Paris's Royal Institution for Blind Youth. He tried to share it with his teachers, too. They weren't too happy about it. But the sighted teachers refused to learn it, and many of them actually banned their pupils from using it. They claimed the paper-punching noise they made while taking notes was a distraction.
But the students kept on using it. Older students taught the system to younger children when adults weren't watching. The faculty tried to punish them in many ways, including depriving them of food. They still wouldn't give up. Eventually, the administrators caved in and adopted the use of Braille in their school.
Some people have changed the world with spontaneous acts of courage. If you ask me, it takes more courage to do something when you think about it in advance. Calvin Graham knew perfectly well that he could die when he joined the military. He served his country anyways. Louis Braille and his fellow students knew they would be punished. They didn't quit. Stamina like that is rare, even among adults. Let's not forget their bravery and determination.