These differences are the outcome of the pious-impious deeds of the previous births. Suppose a person is always kicking the cross of Jesus. Tell me, what is the use of giving him legs? A person who constantly uses foul language will experience speech impairment in another birth. There is a sacred text called ‘karma vipaka yoga’ which explains how the present good and bad experiences are the outcome of the pious-impious deeds of previous births.
– Glimpses of Bhaktimala -4