It took me awhile to get into the habit of keeping a journal, but once I figured out what works best for me it became much easier. I use my datebook to keep track of things I need to do, things that happen that week, my personal thoughts, and plans for the future.
My version of a journal may be different from yours, but all that's important is that you write what down what's important to you.
Here are some basic reasons to keep a journal...
Opening up to new possibilities
Do you keep a journal? What is your reason?