In Ethics, he distinguished between duty to the community (an ethical matter) and duty to God (a religious matter). He believed that any moral action is the action of the human will (which is governed by belief and spurred on by the passions), that good habit is what aids men in directing their will toward the good, but that no universal rules can be made, as both situations and men's characters differ. One of his many aphorisms was that "a little philosophy inclineth man's mind to Atheism; but depth in philosophy bringeth men's minds about to religion".
Among his earlier publication were the "Essays", the "Colours of Good and Evil", the "Meditationes Sacrae" (which includes his famous aphorism, "knowledge is power", an early expression of Pragmatism), and the "Proficience and Advancement of Learning". In 1620, his "Novum Organum" ("The New Instrument"), the most important part of his fragmentary and incomplete "Instauratio Magna" ("The Great Renewal"), was published, and a second part, "De Augmentis Scientiarum" ("The Advancement of Learning"), was published in 1623.