Merlin the Magical Mystic

What makes a mystic and what makes a magic user? Up until this point there was some sort of line between the two such as the difference between a midwife sacrificing her child to Satan to understand the future and Margery Kempe crying because of her visions in public. One was influenced by God himself and the other was for more selfish means. But where does that leave Merlin? Clearly he has abilities to see prophesied events, but one part really stuck out to me that made me think the magic vs. mystic line was muddied:

"...I am the son of a demon who seduced my mother...He gave me the ability to know all things said and done in the past and that is how I know what life your mother has lead. Our lord wanted me to have that memory because of my mother's virtue and her true repentance, and because of my own submission to the commandments of the Holy Church...granted me the power to know the things that are to come."

So...he's the son of a demon and knows the past...but also knows the future because he's aligned himself with God...can he pick one? But, in my own view this muddies up the line between magic and mysticism again. Yes, it's true Merlin woks under God, but what about the gray area BEFORE he joined the church? Much to think about...Maybe the truth is that Merlin is both and can be both because of who he is?