He was a Lutheran mystic who denied sola fide. He was known for his strange and mystical interpretations of many aspects of Christian theology. I found out about him because I was looking at these Christian mystics from hundreds of years ago who departed from the orthodox faith such as Swedenborg or Lorber, and Böhme seemed to be the only one who was a trinitarian. Here are some choice quotes
>We men have one book in common which points to God. Each has it within himself, which is the priceless Name of God. Its letters are the flames of His love, which He out of His heart in the priceless Name of Jesus has revealed in us. Read these letters in your hearts and spirits and you have books enough. All the writings of the children of God direct you unto that one book, for therein lie all the treasures of wisdom. … This book is Christ in you.
>For he that will say, I have a Will, and would willingly do Good, but the earthly Flesh which I carry about me, keepeth me back, so that I cannot; yet I shall be saved by Grace, for the Merits of Christ. I comfort myself with his Merit and Sufferings; who will receive me of mere Grace, without any Merits of my own, and forgive me my Sins. Such a one, I say, is like a Man that knoweth what Food is good for his Health, yet will not eat of it, but eateth Poison instead thereof, from whence Sickness and Death, will certainly follow.
>If thou wilt use these Words aright, and art in good Earnest, thou shalt certainly find the Benefit thereof. But I desire thou mayest be warned, if thou art not in Earnest, not to meddle with the dear Names of God, in and by which the most High Holiness is invoked, moved, and powerfully desired, lest they kindle the Anger of God in thy Soul. For we must not abuse the Holy Names of God. This little Book is only for those that would fain repent, and are in a Desire to begin. Such will find what Manner of Words therein, and whence they are born. Be you herewith commended to the Eternal Goodness and Mercy of God.
https://en.wikipedia.org/wiki/Jakob_Böhme