The prayer has an outer form and an inner reality. The prayer is incomplete and imperfect without the establishment of both. The outer form includes the standing (al-qiyam), the recitation (al-qira’ah), the bowing (al-ruku’), prostration (al-sajdah) and the like. The inner realities include presence (al khushu’), concentration of the heart (hudur al qalb), complete sincerity, contemplation of the meanings of the recitation and the glorification (tasbih) and other elements from the inner dimensions of the prayer.
– Imam Abdullah bin Alawi al Haddad