Q 122 What is the sum of the six commandments which contain our duty to man?

A.
The sum of the six commandments which contain our duty to man, is, to love our neighbour as ourselves,[646] and to do to others what we would have them to do to us.[647]

[646] Matthew 22:39. And the second is like unto it, Thou shalt love thy neighbour as thyself.

[647] Matthew 7:12. Therefore all things whatsoever ye would that men should do to you, do ye even so to them: for this is the law and the prophets.