The term evangelical (from the Greek word for gospel) has several meanings; for the purpose of this entry, it will refer to an English-speaking Protestant development that emphasizes personal religion (focused on Christ), Biblical authority and preaching, missions, and evangelism. The origins of this particular type of evangelical Christianity stretch back to eighteenth-century revivals in England and America, with such leading figures as John and Charles Wesley, Jonathan Edwards, and George Whitefield. Early evangelical leaders and scholars accepted a harmony between natural science and religious faith, typical of the age of British natural theology. Edwards saw the glory of God revealed in a spider's web, while Wesley could find the wisdom of God revealed in creation as understood by the natural science of his day. For the most part, evangelical scientists and theologians sought a harmony between science and Scripture.