Aaron Hills was president of Texas Holiness University. Hills was so heavily influenced by Charles G. Finney that he wrote a book about Finney's life. Hills was part of the Holiness movement, which emphasized that the process of salvation involves two crises. In the first, conversion or justification, one is freed from the sins he has committed. In the second, entire sanctification or full salvation, one is liberated from the flaw in his moral nature that causes him to sin.

Andrew Murray (1828-1917) - Born in Graaff Reinet, South Africa, Andrew grew up in a home filled with prayer and worship where his father, the Rev. Andrew Murray Sr. was ministering to Dutch Settlers. At the age of 10 he was sent to school in Scotland and after college went to Holland to study theology. As a result of the teachings of his father, his uncle (the Rev. John Murray), and many others he met during his schooling, the young man developed a very strong foundation of faith, prayer, worship, love for the lost, and above all the attitude that Jesus Christ should be the center of our attention. Ordained at the age of 20, Andrew returned to South Africa and started ministering to the Dutch Farmers. In 1860 he became the pastor of the Dutch Reformed church at Worcester. Later he would be part of the Keswick movement and the minister of the Dutch Reformed Church of Wellington from 1871 to 1906.

Author of Forty Witness, a collection that details their witness to the baptism of holiness that all believers are called to.