Out of this arrangement, also, springs Obligation; the law of conscience is the law of our nature.

It carries its authority with it; it is the guide assigned by the Author of our nature.
He then replies to the question, 'Why should we be concerned about anything out of or beyond ourselves ?' Supposing we do possess in our nature a regard to the well-being of others, why may we not set that aside as being in our way to our own good.
The answer is, We cannot obtain our own good without having regard to others, and undergoing the restraints prescribed by morality.

There is seldom any inconsistency between our duty and our interest.

Self-love, in the present world, coincides with virtue.

If there are any exceptions, all will be set right in the final distribution of things.
Conscience and self-love, if we understand our true happiness, always lead us the same way.
Such is a brief outline of the celebrated 'Three Sermons on Human Nature.' The radical defect of the whole scheme lies in its Psychological basis.