The early years of the 19th century once again saw an increased public interest in abolition. In 1804, Clarkson resumed his work and the Society for Effecting the Abolition of the Slave Trade began meeting again, strengthened with prominent new members such as Zachary Macaulay, Henry Brougham and James Stephen. In June 1804, Wilberforce's bill to abolish the slave trade successfully passed all its stages through the House of Commons. However, it was too late in the parliamentary session for it to complete its passage through the House of Lords. On its reintroduction during the 1805 session, it was defeated, with even the usually sympathetic Pitt failing to support it. On this occasion and throughout the campaign, abolition was held back by Wilberforce's trusting, even credulous nature, and his deferential attitude towards those in power. He found it difficult to believe that men of rank would not do what he perceived to be the right thing, and was reluctant to confront them when they did not.