He continued to support institutionalised Unitarianism for the rest of his life, writing several Defenses of Unitarianism and encouraging the foundation of new Unitarian chapels throughout Britain and the United States.
Ia terus memberi dukungan terhadap pelembagaan Unitarianisme sepanjang hidupnya, menulis beberapa Pembelaan bagi Unitarianisme serta mendorong didirikannya kapel-kapel Unitarian baru di seluruh Britania Raya dan Amerika Serikat.