What Is a Prayer?
A request is something that a person feels that he is lacking. It is in the heart. It makes no difference what he says since “a request” means that one asks for what he lacks, and all of one’s wants are not in the mouth, but in the heart. Therefore, it makes no difference what a person says, but the Creator knows the thoughts. Hence, Above, only what the heart demands is heard, not what the mouth demands, for the above reason that the mouth is not deficient and needs to be satisfied.
– Rabash, The Rungs of the Ladder, “What is, ‘A Woman Who Inseminates First, Gives Birth to a Male,’ in the Work”
The Creator hears a prayer, and only awaits a whole prayer.
– Baal HaSulam, Letter no. 57