It is not earthly wealth that makes man rich. Riches come by discovering that gold-mine which is hidden in the human heart, out of which comes the spirit of generosity. Someone asked the Prophet, whose virtue was the greatest -- that of the pious soul who prays continually or that of the traveller who travels to make the holy pilgrimage, or of the one who fasts for nights and days, or of the one who learns the Scripture by heart.