It suggests that spoken words can be more moving than written ones (don't ask me why- it's their theory, not mine).
Words are intangible, unlike the external word around us. The use of 'tranlaste' is a bit strange- I presume it means that we have to absorb them and 'tranlsate' them into something that we can respond too- associating them with the memories in the sentence earlier. The words themselves become emotional through this process.
(The passage isn't terribly clear to me- I can't see why written words are less emotional, which is the implication of 'especially'.)
- For Teachers