In the realm of morals his standard is utility--that is good which helps him to obtain more pleasure and to avoid pain.

In social life his conduct is dictated by custom--this is the highest appeal.

The development of man along the lines of nature ends at this point--and if nothing more is to happen, then he must remain at a low level of development.

Matter and mind cannot take him beyond--the mind as such only helps towards the further satisfaction of the lower demands of man.
But there is something far greater in highly developed manhood than the petty and selfish.

Man is capable of conceiving and adopting higher standards of morality than those of utility and pleasure, and it is the spiritual life that enables him to do this.