WAIT. THERE IS A SECOND RULE I FORGOT: DO NOT DELETE OR THROW ANYTHING AWAY OF YOUR JOURNALING
Do not throw away or delete anything you journal. (No matter how much you might be tempted.) Not even a sentence.
Rather, if you must, just put one line through the text (so you can still see it and read it again later). But, it would be best if you didn't even do that.
Why shouldn't you throw away any of your journaling? You might be scratching your head and that one at the best. Or, at the worst, you might strongly disagree.
Some people recommend tearing up a journal entry as a way to emote (release emotion) and let something go. If you feel the desire to do this, either copy it and destroy a copy, or so this with blank pieces of paper and pretend it's the journal entry you want to use to emote.