Be constant in your practice, and one day the One who gave you the desire for the prayer of the heart will give you that prayer itself. When your heart's intention is fixed on God, it will keep lit the incense of your prayer, and wind of distraction will not put it out. do not worry about stray thoughts; they may come and go, but they will not take your attention away from God.
It does not cost much. It is pleasant: one of those almost hypnotic businesses, like a dance from some ancient ceremony. It leaves you filled with peace, and the house filled with one of the world's sweetest smells. But it takes a lot of time. If you can find that, the rest is easy. And if you cannot rightly find it, make it, for probably there is no chiropractic treatment, no Yoga exercise, no hour of meditation in a music-throbbing chapel, that will leave you emptier of bad thoughts than this homely ceremony of making bread.