Dr. Johnson revised his moral philosophy textbook again, titling it "Ethices Elementa: or the First Principles of Moral Philosophy". According to educator Henry Barnard, “This work had a high reputation at the time of its publication, and met with an extensive sales.” He revised it again with editions released in 1752 in Philadelphia and 1754 in London. Professor Mark Garett Longaker noted that it contained "a system of morals built upon his philosophical idealism, and the conclusion of this entire system (moral, philosophical, and rhetorical) is that all human endeavor aims towards happiness, a condition realized when one fully understands and obeys God's will."