William Williams (1717–1791) is celebrated as the 'Sweet Singer of Wales' and was a primary leader of the Welsh Methodist revival. Over a period of forty-five years, he traveled over 100,000 miles on horseback across the rugged Welsh hills to preach the Gospel in the open air, surviving freezing winter storms and hostile mobs. He wrote the original Welsh text of 'Guide Me, O Thou Great Jehovah', drawing on the imagery of the biblical Exodus to describe the Christian life as a journey through a dry wilderness, guided and sustained by God's bread of heaven.