Angels have a conscience. They do always what is right, and never otherwise than what is right. But they do not do it under the compulsions of conscience, but from the excellent and just impulses of a purified and loving nature. Conscience is a law to them, as it is a law to all other holy beings. But law, we are told, "is made for the lawless." (1 Tim. 1: 9.) Those who are not lawless, but whose hearts and actions, of their own accord, harmonize with the law, are under the law without feeling the pressure of the law; rendering obedience to the law, almost without knowing what the law is. If they should attempt or desire to disobey, they would at once have knowledge as distinct as it would be painful. In other words, the operations of the conscience are anticipated and lost, as it were, in the antecedent operations of holy love. And these statements, which apply to angels and other unfallen beings, will apply essentially to men.
— A Treatise on Divine Union (1851) Part 4, Chapter 8.