Please read today's Sunday Times to get the answer to your very good question, my friend. Shortly, the writer, William Dalrymple will be coming out with yet another excellent book which will seek to address exactly the question asked by you here in this forum.
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In this unholy world none can claim himself to be holy. As for Jain nun, they are seeking it after repressing their worldly desires. Undergoing suffering on the other hand by doing the worldly chore would have an easier way.