كتاب ذوق الصلاة

This book, The Desire of Prayer, is a valuable chapter in a nice part, in which Ibn al-Qayyim al-Jawziyya - may God have mercy on him - spoke about the character of prayer in places in his books, in an innovative way, which has not been preceded by what I know.
The book The Desire of Prayer, where he spoke about the heart and brain of prayer, which is reverence from the takbeer to the tasleem.