It was narrated from ‘Aishah that the Prophet صلی اللہ علیہ وآلہ وسلم entered upon her and there was a woman with her. He said: “Who is this?” She said: “So-and-so; she does not sleep” — she mentioned her excessive praying. The Prophet صلی اللہ علیہ وآلہ وسلم said: “Keep quiet. You should do what you are able to, for by Allah, Allah, the Mighty and Sublime, does not get tired (of giving reward) but you get tired. The most beloved religion to Him is that in which a person persists.” (Sahih)