When I pray, I am talking to HaShem. A conviction that during prayer one is talking to oneself, is the death of prayer and the beginning of psychoanalysis. If in prayer the believer comes only to an understanding of himself, it follows that HaShem can be dispensed with altogether. In prayer what is said can only be said directly to HaShem.
People are language users.
If we had no language, we could not be persons. That person can see the difference between what one ought to do and ought not to do. In short, what we say makes a difference. This is the way we use language. The question we need to consider is whether HaShem is a participant in language.