The four kinds of unhindered eloquence are dharma, meaning, words, and joy. When one has these four they are able to teach the dharma without difficulty. You could say they will be confident in their ability to teach the Buddha’s teachings to others. Knowing the meaning and words of the Dharma goes beyond an intellectual understanding or accumulation of information and knowledge. It is about the ability to express the teachings contained in the Dharma in such a way that the listener will be able to understand, and relate to their own lives. … If we are able to relate our own joy as well as cause the listener joy in hearing and understanding then we have been able to accomplish unhindered eloquence. It isn’t about fancy words. It isn’t about sharing information. It is about a deep person-to-person life-to-life communication of the profound nature of the Dharma, which actually transcends words.
Lecture on the Lotus Sutra