These first two scriptures are speaking of the same "Stone", the prophesied Messiah Yeshua (Jesus), the "head of the corner" or "rosh pina", in Hebrew. This stone is laid in Zion, a common synonym for Jerusalem, where mount Zion rests. The stone is "tried", that is, tested in every way that a stone can be; the stone is precious and excellent to be set as a sure, reliable, accurate, even everlasting foundation, and a stone which is prepared and set in place by God, Himself. Can you think of a "Stone" more perfect or beautiful than our Messiah?
When Joseph became ruler over Egypt, his name was changed, and his identity was altered so that he no longer appeared or lived as a shepherd son of Israel from the land of Canaan, but as an Egyptian Prime Minister. The transformation was so thorough that when his ten brothers arrived in Egypt he was totally unrecognizable to them. This true story beautifully illustrates Mashiach ben Yosef (Yeshua/Jesus at His first coming), and contains a prophetic picture pointing to Yeshua and His Jewish people living today as we approach the Second Coming.
It's good to bring those things in our lives, which are hidden in the darkness, to the light. Many times we are slaves to them and we don't even realize it! We will go through a few devotions on this topic this week. God wants us to be free, so that we can be available for Him!