Orthodox Christianity teaches primarily through worship rather than through catechism, and the Liturgy of St John Chrysostom is the medium. It is not read; it is sung continuously, by clergy and by a choir or the whole congregation, for ninety minutes to three hours depending on the parish. Almost nothing in it is optional or seasonal, which means an Orthodox Christian hears the entire theology of the church every single week, in the same words, for a lifetime. The attribution to Chrysostom, who died in 407, is traditional rather than exact — the anaphora may go back to him, the rest accumulated. The longer Liturgy of St Basil replaces it ten times a year, and the Liturgy of the Presanctified Gifts serves weekdays in Lent. The Coptic, Ethiopian, Armenian and Syriac churches have their own, older, family of anaphoras; the Ethiopian church has fourteen and rotates them. Anyone who wants to know what Orthodoxy believes is generally advised to attend rather than to read.