Leonard Ravenhill (1907-1994) was a Christian evangelist and author who focused on the subjects of prayer and revival. He is best known for challenging the modern church and his most notable book is Why Revival Tarries. 

Born in Leeds, in Yorkshire, England, he was educated at Cliff College in England and sat under the ministry of Samuel Chadwick. He was a student of church history and an expert in the field of revival. His meetings in the war years drew large crowds in Britain, and as a result many converts devoted themselves to Christian ministry and the world's mission fields.

Among those influenced by Ravenhill were Ravi Zacharias, Tommy Tenney, Steve Hill, Charles Stanley, Bill Gothard, Paul Washer, and David Wilkerson.  He was a close friend of pastor and writer A. W. Tozer and a prolific writer himself.  Through his teaching and books, Ravenhill addressed the disparities he perceived between the New Testament Church and the Church in his time and called for adherence to the principles of biblical revival.  He is most often quoted as having said:

"If weak in prayer, we are weak everywhere."

"Are the things you are living for worth Christ dying for?"

"God pity us that after years of writing, using mountains of paper and rivers of ink, exhausting flashy terminology about the biggest revival meetings in history, we are still faced with gross corruption in every nation, as well as with the most prayerless church age since Pentecost."

"The Church used to be a lifeboat rescuing the perishing. Now she is a cruise ship recruiting the promising."

"The opportunity of a lifetime must be seized within the lifetime of the opportunity."

"My main ambition in life is to be on the devil's most wanted list."

"If Jesus had preached the same message that ministers preach today, He would never have been crucified."