In his work The Mortification of Sin Puritan John Owen outlines nine directions to help believers in their struggles with sin. The eighth involves meditating on those things that will always result in our humility and awareness of sin. This involves meditating not only on the excellencies and majesty of God, but especially on how little we really know of God.
We know so little of God because it is God we are seeking to know. God Himself has revealed Himself as one who cannot be known. He calls Himself invisible, incomprehensible, and the like. We cannot fully know Him as He is. Our progress often consists more in knowing what He is not, than what He is. He is immortal and infinite and we are only mortal, finite, and limited.
That is truly something to think about!