"The morality of the Rationalist is the morality of the self-conscious pursuit of moral ideals, and the appropriate form of moral education is by precept, by the presentation and explanation of moral principles. This is presented as a higher morality (the morality of the free man: there is no end to the clap-trap) than that of habit, the unselfconscious following of a tradition of moral behaviour; but, in fact, it is merely morality reduced to a technique, to be acquired by training in an ideology rather than an education in behaviour. In morality, as in everything else, the Rationalist aims to begin by getting rid of inherited nescience and then to fill the blank nothingness of an open mind with the items of certain knowledge which he abstracts from his personal experience, and which he believes to be approved by the common ‘reason’ of mankind." -- Michael Oakeshott
What I find very amusing is that, almost every time you point out to a rationalist that the above describes a misunderstanding of morality, they respond, "Well, then, if my technique is no good, what technique do you suggest?" It is almost impossible for them to believe that you are not suggesting that they have simply gotten the wrong self-conscious moral ideals, and that you have a better set to put in their place, but that they fundamentally have misconceived morality.