"You are dumb". "Oh, I am dumb!"

Why one will never be able to express oneself.
There are always restrictions. Some are self-imposed, some are external. It's only because you have to care for the feelings of others. You have the freedom of speech. But the tongue can be the most lethal weapon which inflicts psychological wounds which pierce the brain and stay there forever. Most times, what's said can't be taken back without a scar. It is true especially in the case of children according to studies. If they are taught that they are dumb, they grow up with the impression that they are dumb.