I've been keeping a journal daily for ~2.5 years and I highly recommend it! It's awesome to look back at what I was doing a month or a year ago, and see how I've changed (hopefully for the better).
@flyingpimonster my favorite celebrety - Penn Jilette - says that he keeping journal for like last 20 years. This sounds amazing, but I'm so lacking discipline to do it daily. My journals wither away in 1-2 weeks.
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