The article discusses Berkeley’s idea of how to promote the common good in Ireland in the first half of the 18th century when society differed in respect to religion, political obedience, language, and culture. More specifically, since religion was still the core of Berkeley’s vision of human well-being, the article contains a reconstruction of his views on religious diversity and tolerance, as they were discussed in his works published between the 1730s and 1750s, when he was Bishop in Cloyne and published his most practical works. They will be analyzed in order to present the meaning of an evolution in his attitude towards Irish Catholics during the period. My particular aim is to show that the ‘Good Bishop’ sincerely aimed at the conversion of their hearts to the ‘true religion’, despite his officially moderate attitude towards them after the Jacobite Rebellion of 1745.