God’s revelation, the action of the Trinity, is so discrete that although he’s tendering his grace, one cannot easily perceive it, even to the point of invalidate his grace and therefore living a practical atheism.
15th Century Chart source: http://blogs.buffalonews.com/adam-zyglis/2014/04/science-shmience.html?ref=brp
Mkt Student 
It’s fascinating to consider how God’s grace can be so subtle that it might go unnoticed.