A baby when first born learns in time that words point to things in the real world. Stuff it can touch smell, see, bite on.
Then it grows a bit more and turns into a child and learns that some words are for things that only exist in people's minds. And the child can not touch, see or bite on them. . Like compassion, love and hatred.
Then it grows a bit more and becomes a wise grown up and realizes that stuff that it thought were only in people's minds actually do exist in the real world. Just in the most mysterious ways possible.