The lack of khushu' in prayer and its effect on its reward

Question:
Honorable Shaykh, may Allah preserve you. He says: I maintain the prayers, but he says he does not attain khushu', even though I maintain the obligatory prayers at their times. Does the prayer decrease?

Answer:
Yes, the prayer is deficient. He has only what he understood of it and what his heart was present for in it. He may be recorded as having a complete prayer, or he may be recorded as having less than that, or he may be recorded as having nothing if he does not have khushu' in his prayer.
Khushu' is the spirit of the prayer. One avoids things that disturb his khushu', such as praying while holding in his urine, or while being urged by the two excretions, urine and feces, or praying in a place that is extremely hot or extremely cold. One avoids the causes that remove khushu' or distract him from it. He also approaches the prayer with calmness and dignity; he does not approach it by running or sprinting, but he walks with calmness, as the Prophet (peace and blessings be upon him) commanded. Yes.