Dr. Steven Lawson, an expository teacher to pastors and preachers, gives us a lesson about one of the attributes of God; His Immutability.  God Does not change. Ever.  And also, His salvation and truth never change.  Once we grasp that concept we can be confident in our salvation promises, or rejoice in what we already know.  The section on "truth" alone is enough to make you want to listen and share this message over again.