Concerning the Ten Commandments, which are the Heads of the Law (39)

And, secondly, we must say that any one addressing himself to an assembly in common as to a multitude is not bound to speak as if he were conversing with a single individual, but sometimes he commands or forbids a thing in a particular manner in such a way that whatever he commands does at once appear requisite to be done by every one who hears him, and does also seem to be commanded to the whole collective multitude together; for the man who receives an admonition as if addressed to himself personally is more inclined to obey it; but he who hears it as if it were only directed to him in common with others is, to a certain degree, rendered deaf to it, making the multitude a kind of veil and excuse for his obstinacy. [*] [*]