The days passed and Joseph grew. Almighty Allah said: And when he (Joseph) attained his full manhood. We gave him wisdom and knowledge (the Prophethood), thus We reward the doers of good. Surah 12: 22
He was given wisdom in affairs and knowledge of life and its conditions. He was given the art of conversation, captivating those who heard him. He was given nobility and self-restraint, which made him an irresistible personality. His master soon knew that Allah had graced him with Joseph. He understood that Joseph was the most honest, straightforward and noble person he had met in his life. Therefore, he put Joseph in charge of his household, honored him, and treated him as a son.