647. Is the whole of the law of God contained in the rule of love of the neighbour laid down by Jesus?
"That rule certainly contains all the duties of men to one another; but it is necessary to show them its various applications, or they will continue to neglect them, as they do at the present day. Besides, natural law embraces all the circumstances of life, and the rule you have cited is only a part of it. Men need precise directions; general precepts are too vague, and leave too many doors open to human interpretations."
648. What do you think of the division of natural law into ten parts, viz., the laws of adoration, labour, reproduction, preservation, society, equality, liberty, justice, love, and charity?
"The division of the law of God into ten parts is that of Moses, and may be made to include all the circumstances of life, which is the essential point. You may therefore adopt it, without its being held to have any absolute value, any more than the various other systems of classification which depend on the aspect under which the subject is considered. The last of those parts is the most important; because the law of charity includes all the others, and it is therefore through the observance of this law that mankind advances most rapidly in spiritual life."