Until the age of twenty-eight, Johnson lived under the yolk of his slave masters. As a servant he was subject to abuse for trivial matters, such as not knowing the difference between right and left. Sold on by his master whilst still a teenager, the author had already self-taught himself rudiments of literacy from letters and newspapers left around his master's house. Luckily, his new master's son was kind, and helped Johnson with vocabulary and letters. This knowledge helped Johnson keep aware of developments - the abolitionist movement, which sought freedom for all slaves, was of particular interest, as were the politics of Britain, which had already outlawed slavery.

Significantly, Thomas also became interested in religion, learning many words, expressions and lessons from the Bible. After emancipation, this knowledge spurred him on to join the priesthood. He travelled to New York, and soon discovered his natural talent for speaking. A black preacher so soon after emancipation was an unusual sight; it wasn't long before Johnson had made friends and began to contemplate further travels to spread God's word. Sure enough, his talents saw him permanently resettle in England, and embark upon travels even farther afield.