Comparison between the Simple Order of Service of the Reformed Church and that of the Lutheran with its richer content has led to the opinion that Luther merely purged the Mass of some objectionable elements; the Reformers on the contrary totally reconstructed the divine service according to the principle of their knowledge of God. Research into the history of the liturgy has proved that such is not the case. The Strasbourg order of public worship which was brought by Calvin to Geneva and thence passed on to a wider circle of Churches shows clearly its derivation from the medieval Mass, as with the majority of Lutheran orders. The sermon is inserted between two parts of the service which have their origin in the Mass, and the concluding portion of the service is so shaped that Communion may at any time be included in it.