Kant

In the search for intrinsic 'good', Kant did not believe that any outcome was inherently good. Pleasure or happiness could result out of the most evil acts. He used the term good to describe the 'good will' by which he meant the resolve to act purely in accordance with ones duty. He believed that using reason, an individual could work out whats ones duty was.

Free Will, God and Immoratality

If our actions are pre determined we canbot be descirbed as free and morality doesnt apply to us. Kant could not prove that we are free - rather, he presumed that we could act morally and for this to be the case we must be free. He also though that there must be a God and life after death otherwise morality would make no sense.

We do not follow predetermined laws. However we must act according to some laws, otherwise our actions are random and without purpose. As a result rational beings must determine for themselves a set of laws by which they will act.

These laws are not analytic (true by virtue of their meaning) but they cannot be dtermined through experience (a posteriori). Hume pointed this out when he said that you couldnt move from an is (a synthetic statement about the world) to an ought (a statement about the way the world should be). The rational being has to dtermine the synthetic a priori - rules that can be applied prior to experience.

An imperative is a statement of what should be done. We have said before that Hme realise you cant get a should statement out of an is statement. In other words, experience can only give us hypothetical imperatives (if you want to be healthy then you should exercise and watch what you eat). A description of the way the world is cannot tell us the way we should act.

The categorical imperative is a should statement but it is not based on experience and doesnt rely on a particular outcome. Rther it logically precedes experience or helps us make sense of experience. In another areao f thinking Kant showed that we must presume that time moves forwards  our mind imposes this on our experiences to make sense of them, We therefore could never demonstare or prove this through experience.

Like with the categorical imperative. certain actions are logically inconsistant and would make no sense as universal laws, such as lying. As a result 'do not lie' is a categorical imperative. Understanding that our mind plays an active role in ordering and shaping our expereince was revolutionary and is Kants greatest achievement.

Kant states that the categorical imperative as follows.

I ought never to act except in such a way  that I can also will that my maxim should become a universal law.

The Categorical Imperative – Law of Nature

 Kant also states the categorical imperative as follows:

Act as if the maxim of your action were to become by your will a universal law of nature.

It is difficult to see how these two statements are different, and many texts treat them as though they say the same thing. However, I think they give a real insight into how Kant perceived the Categorical Imperative. Have a look at how the categorical imperative can be applied to euthanasia.

The Categorical Imperative – Ends and means - A good will is one that acts in accordance with rationally-determined duty.  No character trait or consequence is good in itself.  However, as good is defined in terms of rationality, Kant argued that all rational beings were ends in themselves and should never be treated purely as a means to an end.  He put this two different ways:  - So act as to treat humanity, whether in your own person or in that of any other, in every case as an end in itself, never as means only. These latter statements of the Categorical Imperative are really an extension of the statements regarding universalisability – we hold laws if we would will that all other rational beings would also follow them.  As a result, it would be contradictory for any rule to treat a rational being as a means to some greater end: there can be no greater end.  Put another way, I cannot prescribe a rule that, if held by someone else, would result in my being treated merely as a means to end.

So act as if you were through your maxims a law-making member of a kingdom of ends.

The categorical Imperative, stated four different ways above, could be seen as a rational justification for following the golden rule that is the cornerstone of Christian morals (as well as most other religions):   

Love your neighbour as yourself.