By birth, man is a weak creature. He cannot tolerate even a minor disturbance of his health. A person who does not enjoy good health cannot do anything properly. That is why one should engage much in dua (supplication) so that one becomes capable of fulfilling all of one’s responsibilities in the right way. But dua  is not simply repeating some Arabic words that one has memorized. The true dua is one that is based in and emerges from marifat or God-realization. It is the dua that emerges from the depths of one’s heart, and not simply something that is repeated mechanically on the tongue. It is this sort of prayer that definitely reaches God and is accepted by Him.