What may be called the severe and ascetic systems (theoretically) refuse to sanction any pursuit of happiness or pleasure, except through virtue, or duty to others.

The view practically proceeded upon, now and in most ages, is that virtue discharges a man's obligations to his fellows, which being accomplished, he is then at liberty to seek what pleases himself.

(For the application of the laws of mind to the theory of HAPPINESS, see Appendix C.) IV.-The CLASSIFICATION OF DUTIES is characteristic of different systems and different authors.

The oldest scheme is the Four Cardinal Virtues--Prudence, Courage, Temperance, Justice.

The modern Christian moralists usually adopt the division--Duties to God, to Others, to Self.
Moreover, there are differences in the substance of Morality itself, or the things actually imposed.