"I owe to a journey I made with Mr Smith from Edinburgh to London, the difference between light and darkness through the best part of my life. The novelty of his principles, added to my youth and prejudices, made me unable to comprehend them at the time, but he urged them with so much benevolence, as well as eloquence, that they took a certain hold, which, though it did not develop itself so as to arrive at full conviction for some few years after, I can fairly say, has constituted, ever since, the happiness of my life, as well as any little consideration I may have enjoyed in it."