This Hadith tells us about the etiquette of praying to Allah. We should use the Names of Allah befitting our prayers, i.e., the Names of Allah signifying those Attributes of Allah which have a special concern with the subject of our particular prayer, i.e., while seeking forgiveness, His Names concerning His Attributes of forgiveness and kindness should be used. On the other hand, while praying for worldly matters, we should mention His Qualities of charity and bestowing gifts etc.