So long as all the moralists content themselves with preaching a return to a system which is as dead as the Dodo, they can do nothing whatever to moralize the new freedom or to point out the new duties which it brings with it. I do not think that the new system, any more than the old, should involve unbridled yielding to impulse, but I think the occasions for restraining impulse and the motives for doing so will have to be different from what they have been in the past.
Source: Bertrand Russell :Marriage and Morals, 1929
More info.: https://russell-j.com/beginner/MM07-110.HTM