Faithful:

I wasn't faithful...

I wasn't trust worthy...

Its His faithfulness what made me be faithful!

His trust worthiness is what made me be trust worthy! 

God is faithful and he honors faithfulness. He acknowledges faithful and will deal with them bountifully. When Joseph was faithful in every thing he did no matter its in his home, with his brothers, in ruler-ship, in slavery; it seems like it was God's job to bless him in everything he does for being faithful!