“Think with your heart, not your head.” This phrase, which is received as a cliché when heard by many today, defined a period in colonial history that has been labeled the “First Great Awakening.” This “Awakening,” was a direct response to the Enlightenment that had swept through Europe and challenged religion with science and reason. Throughout the first half of the eighteenth century, the thirteen colonies were lit ablaze by a philosophical battle between groups dubbed “Old Lights” and “New Lights,” who fought for the religious soul of the people. Fiery and passionate leaders like Jonathan Edwards and George Whitefield revitalized religion in the colonies and provided the future revolutionary generation with a taste of greater equality and self-determination."
Taken from William R. Griffith IV article on The Great Awakening
Answered by Fire : The Cane Ridge Revival Reconsidered by 
The Eager Feet : Evangelical Awakenings, 1790-1830 by 
George Whitefield and the Great Awakening by 
God is a Communicative Being : Divine Communicativeness and Harmony in the Theology of Jonathan Edwards by The Great Awakenings and the Restoration Movement by History of the Christian Church : Volume 4: The Puritan Reform and the Evangelical Revival: 1648-1800 A.D by 
Revival and Revivalism : The Making and Marring of American Evangelicalism 1750-1858 by