Hakeemul Ummat Hazrat Mawlana Ashraf Ali Thanawi ra said:

“The achievement of goal is not dependent on how much you toil & labor.

It is contingent on working according to the yearning and determination within your means.

Pious elders have said that six units of prayer by a sick and feeble are equal to six hundred rakah of a strong healthy person. This is so because the feeble has the strength of praying six units only and Allah SWT rewards him, for He knows the condition and capabiity of all very well.”

Ma’asir e Hakeemul Ummat ra, pge 179