Jon Kabat-Zinn:

Cultivating mindfulness is not unlike the process of eating. It would be absurd to propose that someone else eat for you. And when you go to a restaurant, you don't eat the menu, mistaking it for the meal, nor are you nourished by listening to the waiter describe the food. You have to actually eat the food for it to nourish you. In the same way, you have to actually practice mindfulness in order to reap its benefits and come to understand why it is so valuable.