First, Kant presupposes that there is a moral law. That is, there exists some basis for morality beyond subjective description of it. He then begins with a series of identifications to answer how the moral law possibly gives a pure abstract form of a moral law that will ask if it is really moral. He says the only good thing that exists without qualifications is a good will (or good intentions). Other things may bring goodness, but always with qualifications. For example, happiness is a good thing in itself, but if there is a qualification that a happiness could be caused by harming someone, it is no longer good. Or perhaps we could say that someone is very ‘good’ at making money, but this does not necessarily imply overall ‘goodness’ (in the case of Wall Street banks, for example). This is a somewhat circular argument, in that he says that what is inherently ‘good’ (or moral) is a ‘good will’. He, thus, further defines it as: a good will acts for the sake of duty alone.
In other words, a good will does the right thing only for the reason that it is the right thing, and for no other reason. Not for happiness, personal gain, personal inclination, but only because it is ‘the right thing to do’. Kant sees this duty to ‘do the right thing’ as a triumph of reason in the struggle over superstition.
But what is ‘good will’? And how can we know what our ‘duty’ is? And will there be problems with always doing this ‘duty’, no matter the extenuating circumstances? Well,
Kant begins to answer these questions with another circular argument, saying that ‘duty’ is when someone acts in accordance with the ‘moral law’. This does not appear to clear up the confusion at all, if duty is defined by moral law, and vice versa, and we’re back where we started from. Kant continues, however, by proposing a solution in the form of a universal moral law that can be inserted as a sort of formula to determine the