If it is to be a moral quality, it must also give us positive pleasure.

Indeed, it must not so much be obedience to the law as an impassioned co-operation with it.
Now this, if producible, even though no further moral aim was connected with it, would undoubtedly be of itself a moral element.

Suppose two pigs, for instance, had only a single wallowing-place, and each would like naturally to wallow in it for ever.

If each pig in turn were to rejoice to make room for his brother, and were consciously to regulate his delight in becoming filthy himself by an equal delight in seeing his brother becoming filthy also, we should doubtless here be in the presence of a certain moral element.

And though this, in a human society, might not carry us so far as we require to be carried, it would, without doubt, if producible, carry us a certain way.