DEUT1696 Therefore, my brother, fix firmly in your heart the meaning of your prayer. Let it correspond with the words you utter. Let both [words and thought] be directed to God alone. Free your body of all motion, and restrain your senses and thoughts from involvement in any worldly matter while you are praying. Take an example from how you would act were you standing in the presence of your sovereign, thanking and praising him and recounting his favors, even though he is ignorant of what is in your heart. Certainly, then, you should act this way toward the Creator, May He be exalted, Who observes your outer life and inner life, your hidden and revealed self. It is a wonder [that you would even consider behaving otherwise], as prayer is given to you by God on trust, a security that He has placed in your hands and under your control; no one can monitor it besides Him. If you pray as God has commanded, you live up to the trust He places in you, and He will accept your prayer. If, however, when you pray you are not sincere--either in your heart or with your tongue-- you will be counted among those who violate God's trust, of whom Scripture says: “For they are a fickle generation, children who are not to be trusted” (Devarim 32:20). But of trustworthy people, who live up to the standards and conditions of a trust, it says: “My eyes are on the most faithful in the land, that they may reside with me” (Tehillim 101:6).