Humility in Prayer, by Al-Hafiz Ibn Rajab Al-Hanbali
The importance of humility in prayer is felt in two aspects: The first is that it perfects prayer and is its very essence. Humility means the presence of the heart, that when the person prays, recites, bows and prostrates, he keeps in mind that he is in this great worship. She must not do these things when her heart is elsewhere. The second is that humility in prayer increases its reward. Allah, Mighty and Exalted be He, has indeed praised those who are humble in their prayer.