" Setting your intention is the root of success. Do you "have" to do it, or do you "want" to do it? A strong desire guided by the right intention will get you started powerfully. It is very important that you set the right frame of mind and the way to think about the program you are about to start. If you think about this program as something you *have* to do for your health it will not be as powerful as thinking about it as something you *want* to do. Obligation isn't nearly as strong a driving force as desire.
We always make times for what we want. When we have a burning desire for something, we will go the extra mile or turn the planet upside down to get it. Think about it: whatever you have spent time wanting in life, you probably already have. But consider also how wanting something is usually an unconscious impulse. You see something and have to have it. The "want" is triggered almost unconsciously, and the stronger it is, the quicker you tend to get the object of your desire. Yet there are ways to cultivate or build up that desire for something -- even if you feel hesitant or resistant about it at the beginning. Setting an intention is how you actively cultivate desire, so that it can propel you to success and get you over hurdles. (p. 164) "

― Alejandro Junger , Clean: The Revolutionary Program to Restore the Body's Natural Ability to Heal Itself