Were it possible to examine just a part of God, and not all of him at once, that part would be all that God is. To put this in more concrete terms, even though we can never comprehend all that God is, even what little we do know is sufficient to warrant trust and belief, because God is not different and some other part of his being that we have not yet encountered.  We will not, for example, discover one daythatGod has an evil side to him that we could not have predicted.

David Gibson, From Heaven He Came and Sought Her: Definite Atonement in Historical, Biblical, Theological, and Pastoral Perspective, ed. David Gibson and Jonathan Gibson (Wheaton, IL: Crossway Books, 2013), 86 – 87.