Meditation is a lot like cultivating a new land. To make a field out of a forest, first you have to clear the trees and pull out the stumps. Then you till the soil and fertilize it, sow your seed, and harvest your crops. To cultivate your mind, first you have to clear out the various irritants that are in the way—pull them right out by the root so that they won’t grow back. Then you fertilize: you pump energy and discipline into the mental soil. Then you sow the seed, and harvest your crops of faith, morality, mindfulness, and wisdom.
Faith and morality, by the way, have a special meaning in this context. Buddhism does not advocate faith in the sense of believing something because it is written in a book, attributed to a prophet, or taught to you by some authority figure. The meaning of faith here is closer to confidence. It is knowing that something is true because you have seen it work, because you have observed that very thing within yourself.
Mindfulness in Plain English: 20th Anniversary Edition by Henepola Gunaratana