Our understanding of truth has to be progressive or we would never grow or learn. That is a big problem to many in comprehending the writings of our pioneers and founders when they  talk about their world as it was then. This has to be progressive as the ways of evangelizing must be. But too often we are stuck in the past century.
 Now Truth as it is in Jesus doesn't change but  we come to understand Him better as we grow spiritually and this must include prayer and study as spiritual disciplines. We must choose what we feed our minds to grow in the spirit.