In principle, membership of these three groups is not hereditary.
It is true that our society is stratified, and very rigidly stratified, on what at first sight appear to be hereditary lines.
In the crucial years, the fact that the Party was not a hereditary body did a great deal to neutralize opposition.
The older kind of Socialist, who had been trained to fight against something called ’class privilege’ assumed that what is not hereditary cannot be permanent.
He did not see that the continuity of an oligarchy need not be physical, nor did he pause to reflect that hereditary aristocracies have always been shortlived, whereas adoptive organizations such as the Catholic Church have sometimes lasted for hundreds or thousands of years.
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It is hereditary, but fortunately not contagious.
It is an unfortunate hereditary condition that is not easily detected even by the regular and thorough cardiac screening.