If we do not believe in what we cannot see, it does not mean that it does not exist. If someone is blind, he cannot see anything, but this does not mean that what he cannot see does not exist, since it can be seen by others.

If we do not believe in what we cannot hear, it does not mean that it does not exist. If someone is deaf, he cannot hear anything, but this does not mean that what he cannot hear does not exist, since it can be heard by others.

If we do not believe in what we cannot say, it does not mean that it does not exist. If someone is mute, he cannot say anything, but this does not mean that what he cannot say does not exist, since it can be said by others.