All that occurs is that, under certain conditions, separate minds have closely similar experiences. Those who are unable to accept this view reject it not on grounds of evidence, not through the ways in which the world influences them, but on grounds of desire, due to the influence of the contrary opinion on their attitudes to their fellows. At moments anyone may wish it otherwise; severance seems a deprivation; caught in a moment of maladjustment we feel that our essential insularity is a blight and a defect, and to accept the facts and upon them to found a new and more perfect adjustment is for all sensitive people in some situations difficult. But the true belief does not, and perhaps no true belief can, really deprive anyone of any values. Sad cases of bad systematisations there doubtless are, for which no readjustment is possible. A false belief may become an indispensable condition for the most important activities of individuals who without it break down into confusion. So it is with many religious beliefs; and in saying that the removal of such beliefs need involve no loss, and may involve great gains in values, we do not say that there are not certain individuals whose values will be destroyed in the process. We say only that adaptable people will find that most of their values can be retained after rejecting their errors, that compensations and equivalents for their losses are available, and that whole sets of fresh values become open to them through their better adjustment to the actual world in which they live. This is the justification for the opinion which has so often been held, that knowledge is the greatest of all goods. The opinion appears to be warranted. Knowledge _is_, we are slowly finding out, an indispensable condition for the attainment of the widest, most stable, and most important values.