I'm not sure I've read much I'd consider profound yet. I don't know. I guess Peter Singer's writings were as close as it gets for me, and life changing. Albert Camus' The Stranger was life changing, too. Although it helped that my emotions were already numbed by a large regimen of zoloft at the time.
I also found many essays of Emerson to be very affirming as a teen. There are also books that have greatly helped me, but I'm not sure they are profound, more instructional.
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