The Cure for Lack of Humility in Prayer
Question :
We hear much about humility in prayer, and I wish to be humble in my prayers, but in no time these words depart and the whispering returns once more. What is the solution? May Allah reward you with good.
Answer:
You must approach prayer taking care that your heart is present therein, and think about what you are saying and about what you hear and reflect on its meanings. And busy your heart with it, to the exclusion of whispering and talking to oneself. Likewise, think about the actions and movements of prayer and the wisdom behind them - all of this will keep your mind busy to the exclusion of whispering. But if you are overcome by external thoughts, there is no sin in this, since this is something natural in human beings, and because of it, the prostration of forgetfulness has been legislated.
Source:
Ibn Jibreen
Fatawa Islamiyah, Vol. 2 Page 198