Christian Existentialism-- is a theo-philosophical movement which takes an existentialist approach to Christian theology. The school of thought is often traced back to the work of the Danish philosopher and theologian Søren Kierkegaard (1813–1855), who is considered the father of existentialism.
Irresistible Grace-- (or efficacious grace) is a doctrine in Christian theology particularly associated with Calvinism, which teaches that the saving grace of God is effectually applied to those whom He has determined to save (the elect) and, in God's timing, overcomes their resistance to obeying the call of the gospel, bringing them to faith in Christ
George Whitefield was probably the finest gospel preacher who ever lived and he played a major role in the first great awakening on both sides of the Atlantic. Raised in an English tavern he became well acquainted with life 'in the raw' and by the time he entered university he had developed a vivid imagination and a voice that became so powerful and expressive that it was said he could be heard for five miles!