But this "concepts" of things are built on the relation and iteration of this concepts with our brain.

A baby doesn't born knowing that a table is a table. But they see a table, their parents say the word table, and they end up imprinting that what they have to say when they see that thing is the word table. That then they can relation with other things they know. I've watched some kids grow and learn how to talk lately and it's pretty evident how repetition precedes understanding. Many kids will just repeat words that they parents said in certain situation when they happen to be in the same situation. It's pretty obvious with small kids. But it's a behavior you can also see a lot with adults, just repeating something they heard once they see that particular words fit the context

Also it's interesting that language can actually influence the way concepts are constructed in the brain. For instance ancient greeks saw blue and green as the same colour, because they did only have one word for both colours.