This is one of them.
The Knowledge of the Holy by A.W. Tozer is one of the most important books you will read. I try to read it at least once a year. This little book of 117 pages focuses on the attibutes of God. Tozer does a wonderful job teaching who God is and what he is like. It's an inspiring work.
If you have never read it I encourage you to get a copy and read it at least once a year. You will find that it will change how you view almost everything!