The character of Christ and the fulfilling of Josephs dream...
verse 23 shows in Joseph a characteristic of Christ - by saying "peace be unto you - fear not" bringing Simeon in unharmed after he had already gave them more to go away with than what they came with - both the food and the return of the money - this is what Christ does for us! He takes our offering and gives back more...this often looks like more work, yet it is just more opportunity. Verse 28 is the fulfilling of Joseph's dream - no grumbling brothers now! They are simply grateful. Gratitude makes all the difference :)