In short...
In short, these supplications cover all aspects of morality and self-discipline as well as all aspects of Muslim belief. Furthermore, they are the most important references to philosophical views and scientific research in the fields of Divinity and ethics.
Had all people been able to abide by the points of true guidance that are introduced in the excellent contents of these supplications, there would have been no single trace left for corruption on this globe, which is overburdened with corruption, and these souls enchained with evil would have soared freely high overhead in the skies of truth.
(12/103) The pillar of evil in human souls lies in self-conceit, blinking at one’s faults, and the false fancy that causes man to reckon that all his deeds are good. Such being the case, man begins to wrong and oppress others, lie to and deceive others, and give free rein to his lust to lead him wherever his caprice commands. Even so, man believes that he is doing exactly what he should do, shutting his eyes to wrongdoing, and treating too lightly his sins.
These supplications, on the other hand, are focused on teaching man how to achieve self-seclusion and devotion to Almighty Allah—two matters that lead man to confess his faults and admit that he is blameworthy and needs to apply himself solely to Almighty Allah, beg Him for forgiveness and acceptance of his repentance.
Thou put into effect through me a decree but I followed the caprice of my own soul, And [I] did not remain wary of the adorning of my enemy. So, he deluded me through my soul's caprice and therein destiny helped him.