We went into a discussion over some esoteric topics, and we got stuck on a definition of a word, so I asked him "but how do we know what exactly does [the word] mean?", to which in response he paused, looked me in the eye, and just said:
It means whatever the hell we agree it means.
That sentence has been with me ever since. For some reason, my whole life before that moment, I've had a feeling that words have some definite meaning that we can somehow learn. Only then did I realize how language actually works - every word is just an agreement between humans.Ever since I've been spending a lot of time learning how to communicate effectively. I believe that a lot of bad things in the world happen simply because of miscommunication of ideas - more precisely, not being in agreement to what some words mean, while using them in discussions, assuming the other person has exactly the same understanding of the word as we do.
Nowdays, in discussions, when I feel that there's "something wrong" in the air, I tend to ask people "what do you mean by X" and some people get annoyed by it. But the number of times I've defused a conflict that way, by revealing it to be pure misunderstanding, makes it worth it.