Preparation for trials through divine guidance

وَلَمَّا بَلَغَ أَشُدَّهُۥٓ ءَاتَيْنَـٰهُ حُكْمًا وَعِلْمًا ۚ وَكَذَٰلِكَ نَجْزِى ٱلْمُحْسِنِينَ

And when he [i.e., Joseph] reached maturity, We gave him judgement and knowledge. And thus We reward the doers of good.