This half-success in a subordinate sphere was, however, so far from coinciding with his aspirations that he had again, in the winter of 1821, begun to turn his attention towards missionary labour in the East, when the possibility of fulfilling the dream of his life was suddenly revealed to him by an invitation from the Caledonian Church, Hatton Garden, London (now the Lumen Church, Bloomsbury), to make trial and proof of his gifts before the remnant of the that held together.