Addressing these various communities, the Apostle cannot occupy himself with the refutation of individual errors, with the remedy of individual needs. Rather he seeks for some one grand comprehensive theme, which shall correspond to the comprehensive destination of the Epistle. This theme he finds in the idea of the Church as embracing all the Churches, the ideal community regarded as one harmonious whole, but comprising diverse branches, diverse offices, diverse members. Starting from the phenomenon of variety, he arrives at the idea of unity. He seeks the centre of union, the principle of cohesion, in Christ the Head. They all are one body, animated by one spirit; they all acknowledge one faith, into which they have been admitted by one baptism; they all are united in the one Lord, and through Him draw near to the one God and Father of all, Who is above all, and through all, and in all.