It seems to me these passages are
talking about the same thing. Morality is that which directs our impulses when
those impulses conflict. Morality helps guide choice and action.
C. S.
Lewis on Instincts and the Moral Law
[S]ome people wrote to me saying, ‘Isn’t
what you call the Moral Law simply our herd instinct and hasn’t it been
developed just like all our other instincts?’ Now I do not deny that we may
have a herd instinct: but that is not what I mean by the Moral Law. We all know what it feels like to be prompted
by instinct—by mother love, or sexual instinct, or the instinct for food. It
means that you feel a strong want or desire to act in a certain way. And, of
course, we sometimes do feel just that sort of desire to help another person:
and no doubt that desire is due to herd instinct. But feeling a desire to help
is quite different from feeling that you ought to help whether you want to or
not. Supposing you hear a cry for help from a man in danger. You will probably
feel two desires—one a desire to give help (due to your herd instinct), the
other a desire to keep out of danger (due to the instinct for
self-preservation). But you will find inside you, in addition to these two
impulses, a third thing which tells you that you ought to follow the impulse to
help, and suppress the impulse to run away. Now this thing that judges between
two instincts, that decides which should be encouraged, cannot itself be either
of them. You might as well say that the sheet of music which tells you, at a
given moment, to play one note on the piano and not another, is itself one of
the notes on the keyboard. The Moral Law tells us the tune we have to play: our
instincts are merely the keys. (C. S. Lewis, Mere Christianity, pp. 9-10)
David
B. Wong on Morality and Natural Drives
This intrapersonal function of
morality comprehends what has been called “the ethical,” as opposed to what
might be called the “narrowly moral.” Morality in the broader sense used here
comprehends the ethical. This part of morality helps human beings to structure
their lives together in a larger sense, that is, not just for the sake of
coordinating with each other but also for the sake of coordination within
themselves. Because the natural drives of human beings are diffuse and general,
and because they are diverse and are liable to come into conflict with each
other, there is a need for a shaping of these drives, and much of it comes from
people telling each other just how these drives should be shaped and how
internal conflicts should be regulated and resolved. (David B. Wong, Natural Moralities, p. 43)