Among other subjects, he wrote on the School of Hierotheus, on Romish falsifications of the Greek Fathers, on Leo XIII., on Liberal Ultramontanism, on the Papal Teaching in regard to Morals, on Vincentius of Lerins and he carried on a controversy with Professor Willibald Beyschlag, of the German Evangelical Church, on the respective merits of Protestantism and Old Catholicism regarded as a basis for teaching the Christian faith.
As these implied a duly appointed minister, the existence of the Church was made to depend upon an organized ministry rather than an organized membership. It calls to mind the Romish formula: "Ubi episcopus ibi ecclesia."
During Charles's last illness in 1685 she showed great anxiety for his reconciliation with the Romish Church, and it was probably effected largely through her influence.
Before a similar mode of reasoning, all the other distinctive articles of the Romish creed "disappeared like a dream "; and " after a full conviction," on Christmas day, 1754, he received the sacrament in the church of Lausanne.
In the autumn of the same year he was appointed to preach in St Mary's on the anniversary of the Gunpowder Plot, and apparently used the occasion to clear himself of a suspicion, which, however, haunted him through life, of a secret leaning to the Romish communion.