Personal well-being is a central concept in philosophical discussions of education and its aims. Although the work of general philosophers like Nussbaum, Griffin, Raz and Sen on the topic has been influential here, there has been next-to-no interest among philosophers of education in John Rawls's work on 'the good' -- in great contrast to interest in his work on 'the right', and despite the key place that his theory of the good has in his Theory of Justice (TJ), Chapter 7. This paper explores a likely reason for this lack of interest. This is connected with Rawls's 1942 undergraduate thesis on the meaning of sin and faith. While there are many continuities between this -- eg. to do with communitarianism and equality -- and the theory of the right in TJ, there are none in the area of the good, since the thesis rejected the notion for theological reasons. In writing TJ, therefore, having long abandoned his Christian belief, Rawls had a rich background of earlier work on the right which he was able to work up into a powerful argument, while in the area of the good he had to start from scratch. The result, drawing on Josiah Royce's ideas about plans of life, is disappointing and open to fairly obvious objections. In the light of this, it is not surprising that Rawls's views on the good have had so little influence in philosophy of education.