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" While the rich reap most of the benefits of technological development , the poor bear an unequal burden of dealing with the consequences of the resulting increased pollution . Such were the things accomplished by Helena , while , under a Christian prince , the world had both attained to liberty , and possessed in him an exemplar of faith . Yet , as an entirely human creation , the study of mathematics is ultimately a study of humanity itself . This valuable information , the child 's learning style , can help the parent to understand and deal with a child who , for example , " never remembers what she tells him . Personal identity , the real existence of the external world , the essential distinction between right and wrong , have all been denied .