Nothing Else

When you pray, you should be careful not to think about anything else, not even about mitzvos. Your mind should be directed exclusively to prayer. Just as all the labor of cultivating the earth - all the work of plowing and sowing - is for the ultimate purpose of producing crops, so to all the work a person does in providing for the body is for the benefit of the soul. Through prayer, you reap the fruits of all your labors during the day.

(Baal HaTurim)