Think of every emotion, surprise, shock, anger, love, joy and happiness. Now think about how much these emotions are evoked by words. Words bring peace, mostly when language reveals truth. One can feel peace when reading the Bible, having God's promises communicated repeatedly. After all, peace is freedom from disturbance.
Words can say so much.
It is the communication of an emotion. It can be a dream for the person hearing it, a hope that the other person will say it back, and it can also be perceived or meant as a commitment. While language has a lot of promise in communication, it has many limitations as communication. Testimonies can be given orally and on paper but the listener and reader cannot experience the experience being communicated to them. In the same way, language cannot convey presentational form or even come close to being able to take its place.