Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

In brief, our meaning is that the change and transformation in the conditions and exigencies of the times is the cause of the abrogation of religious laws, for the time comes when those earlier commandments no longer suit the prevailing conditions. Consider how greatly the exigencies of the modern age differ from those of medieval times! Is it possible that the commandments of former centuries could be enforced in these latter times? It is clear and evident that this would be entirely impossible. Likewise, after the lapse of many centuries, that which is called for at the present time will no longer be suited to the needs of that future age, and change and transformation will be inevitable (20:6)

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