130

4

least illogical form, is an attempt to prove that there is no moral distinction of right and wrong.
The argument is that the distinction, if it exists at all, lies in the motive.
Now the only motive a man can have is his own satisfaction.
For if he really desires to act in any other way, that desire consists in taking satisfaction in that other way of acting,
Thus, there is but one possible motive; and consequently there is no distinction between different motives and no distinction between good and bad morals.

When you compare those two arguments, you see that both alike undertake to refute the distinction of good and bad, the one in reference to cognition, the other in reference to endeavor.
Furthermore, both undertake to do this in the same way, by showing, the one that is unthinkable that a man should reason in a way that does not satisfy him, the other that it is unthinkable that a man should act in a way that does not gratify him.