Thomas Aquinas

“ Yet, just as wise men and the prophets who, consequently, strove to strengthen man in the observance of the Law, delivered their teaching about hope under the form of admonition or command, so too did they in the matter of fear. ”

“ Since, however, when once the Law has been given, it is for a wise man to induce men not only to observe the precepts, but also, and much more, to safeguard the foundation of the Law, therefore, after the first promulgation of the Law, Holy Writ holds out to man many inducements to hope, even by way of warning or command, and not merely by way of promise, as in the Law ”

“ On the other hand filial fear which shows reverence to God, is a sort of genus in respect of the love of God, and a kind of principle of all observances connected with reverence for God. Hence precepts of filial fear are given in the Law, even as precepts of love, because each is a preamble to the external acts prescribed by the Law and to which the precepts of the decalogue refer. Hence in the passage quoted in the argument, "'On the contrary,'" man is required "to have fear, to walk in God's ways," by worshipping Him, and "to love Him." ”

“ In those observances to which man is bound as under a duty, it is enough that he receive an affirmative precept as to what he has to do, wherein is implied the prohibition of what he must avoid doing: thus he is given a precept concerning the honor due to parents, but not a prohibition against dishonoring them, except by the law inflicting punishment on those who dishonor their parents. ”