The sovereignty of God is such that gives Him the right to do as He pleases,whenever He chooses to and however He wants to. When He began creating all things, He was not challenged by anything whatsoever, because all that He called forth understood His Supremacy and simply obeyed.(GENESIS 1)
Being the Awesome God that He is however, He decides to put man in the know of His plans and purpose here on earth, hence the reason He will not do a thing without first revealing it to those who are dear to Him.
AMOS 3:7
“Surely the Lord GOD will do nothing, but he revealeth his secret unto his servants the prophets.Worth Being a Friend of God?