This isn't really about anything, I just want to express my opinion on the topic of journals.  I believe that journals are wonderful.  Personally I have kept a journal since I was in middle school.  I have learned so much about myself and about the way I've changed by keeping a journal.  I have found it very beneficial and rewarding to look back read about details I had forgotten.  Remembering my mistakes and different ways I've dealt with different situations has helped me to come up with my personal thesis for life, to never regret anything.  I don't regret anything because I know that I can learn from everything.  Even if I do something stupid I'll just know what the consequences were and learn from my experience.  By keeping a journal it is very easy to remind myself to stick to my thesis.  Journals are more important than you will ever know.  You can write about anything, what you did that day, what bothers you, what makes you happy.
Re-reading these things helps me deal with current issues, because this way I will always carry those memories with me so that I can learn and look back without regret.