The word homily is derived from the Greek word ὁμιλία ''homilia'' (from ὁμιλεῖν ''homilein''), which means to have communion or hold verbal intercourse with a person. In this sense homilia is used in 1 Corinthians 15:33. In Luke 24:14, we find the word homiloun, and in Acts 24:26, homilei, both used in the sense of "speaking with". Origen was the first to distinguish between logos (sermo) and homilia (tractatus). Since Origen's time homily has meant, and still means, a commentary, without formal introduction, division, or conclusion, on some part of Sacred Scripture, the aim being to explain the literal, and evolve the spiritual, meaning of the Sacred Text. The latter, as a rule, is the more important; but if, as in the case of Origen, more attention be paid to the former, the homily will be called expository rather than moral or hortatory. It is the oldest form of Christian preaching.