This month's free download from Christian Audio is the classic, The Holiness of God, by R.C. Sproul. This is quite simply a must have in one's library, and the fact that you can have it both free and in audio form is a bonus. The late James Boice said,
“It may be a bit early to call R.C. Sproul’s The Holiness of God one of the classical theological works of our time. But if it does not have that status yet, it is well on the way to achieving it.”
I think it is safe to say it has indeed achieved it. I remember watching the DVD series during the summer after my first year of Bible School, and I was changed. My vision of Christ was expanded far beyond what it had been up to that time. In light of Jesus' words in John 17:3, it is paramount that we know God. This work by Sproul will help you do just that.