I like "If you fail to plan, you plan to fail." because I plan my meals and exercise in advance.
If you do what you have always done you will get what you have always gotten. -this one is good as I'm currently changing my eating habits and improving my fitness, reminds me that change is good
I also read somewhere that genuine hunger will occur gradually over time whereas emotional hunger will occur *suddenly*. This is good as it allows me to tell the difference between the two.