Here are a bunch of books--part of the Library of Spiritual Classics, written by believers throughout the ages who have really known and grasped the truths of God. To know the Lord more, read the words of those who have.

The Spiritual Guide and any others by Michael Molinos

The Song of the Bride, Experiencing the Depths of Jesus Christ, Union with God, and any others by Jeanne Guyon

The Seeking Heart by Fenelon

The Normal Christian Life and any others by Watchman Nee

any books by T. Austin Sparks