A week before his death, John Wesley wrote a letter to William Wilberforce, the leading figure in the abolitionist cause in the United Kingdom. Excerpts, from Albert Outler's John Wesley:
Go on, in the name of God and in the power of his might, till even American slavery (the vilest that ever saw the sun) shall vanish away before it.
Reading this morning a tract wrote by a poor African, I was particularly struck by that circumstance that a man who has a black sin, being wronged or outraged by a white man, can have no redress; it being a "law" in all our colonies that the oath of a black against a white goes for nothing. What villany is this?