"I will not forget your word." so says the Psalmist. There is not a huge point in hearing, or reading the words of God if we immediately forget, or ignore, what has been said.
James 1:22-25 says that the person who does that is like someone looking in a mirror, then forgetting what they looked like, but that the perfect word of God gives freedom if we continue to act on it.
We should pray and praise with the Spirit, but also with understanding; it's not a case of one or the other. The two ways of praying go together; they are not polar opposites. Praying with understanding does not mean speaking our mind to God. Instead, we pray first only as the Spirit gives us the ability, and in so doing we find we have understanding we did not have before. Even our ability to pray is His gift to us. As we hear from God we begin to have wisdom and understanding.
"A fool may talk, but a wise man speaks." --- Ben Johnson.