He's the greatest American thinker, that's for sure. Perhaps our greatest author too. A poet, a naturalist, and a spiritualist.
I encourage you to study him deeply to see what I am talking about. He speaks to the human condition in a way no one else has.
He opens your eyes to truths in earlier works and thinkers, and his new perspective on them makes you realize all the more what a treasure he is what a genius he was.
He defended the examined life by living one. He was a close a thing to a modern American prophet as we are going to get, Joseph Smith notwithstanding.
He, in my opinion, was the first to read the Eastern thinkers and fuse their perspective with the Western protestant views of his day into a modern, rational, scientific, yet spiritual philosophy. I differ with him somewhat on ethics, but only in the details. In broad strokes, he was right about everything he ever said, and his relevance has only increased over time.
I really do encourage you not just to read his works, but to read about his works.