Do not be misled by a person's prayers and fasting. [Instead] look [at their] sincerity and wisdom.
He who sleeps without offering the night prayer, may he never enjoy a sound sleep.
The efficacy of a prayer depends not on the words but on the sincerity of intention.
The most important of your affairs in my view is prayer; whoever prays regularly has protected his faith, but whoever neglects it, is bound to be more negligent in other issues of faith.