Over the years I've heard many good things about The Holiness of God by R.C. Sproul (WTS Books | Amazon), but I just never got around to reading it. Last April at Together for the Gospel I received a copy and have recently started working through it. This is one of those books I should have read a long time ago!
Sproul concludes chapter 2, a chapter about Isaiah's encounter with God, by providing a helpful perspective on studying God's holiness.
It's dangerous to assume that because a person is drawn to holiness in his study that he is thereby a holy man. There is irony here. I am sure that the reason I have a deep hunger to learn of the holiness of God is precisely because I am not holy. I am a profane man—a man who spends more time out of the temple than in it. But I have had just enough of a taste of the majesty of God to want more. I know what it means to be a forgiven man and what it means to be sent on a mission. My soul cries for more. My soul needs more.