a perfect example is that of ayyub 'ala nabiyyina wa 'alaihis salatu wassalam. we are healthy and we are sinners; yet we ask for paradise. sayyidina ayyub 'alaihis salam was in difficulty, so what does he say [21:83]? And remember Ayub when he called his Lord that distress has touched me and You are the Most Merciful of the merciful. he could have asked Allah to remove his difficulty but he asks indirectly. he praises Allah and is pleased with what Allah has decreed. he doesn't at all ask Allah to cure him.