Preach the gospel at all times. Use words if necessary
Yet, Francis is known even secularly for his writings--among the first extant ones in the "Italian" vernacular. He used words to preach to the birds and the wolf as well as the people. Perhaps his speech was simply an integrated part of his actions, an unconscious action like lifting one's feet when running.
I think I am uncomfortable with words because they often do not point to mystery. They often appear vain, pointing to my intellectual vanities rather than to the glory of God. This gets paradoxical again--speak without "speaking", simply revealing. Perhaps words are okay as long as they are art, pointing to the golden shekinah that expands from the icons to fill the temple. Yes, that seems to fit: when they reveal God's presence they are golden and when they reveal my emptiness they are drab.