Acts most pleasing to Allah are those done continuously, even if they are small

'A'isha (RadiAllahu 'anha) reported,

 Allah's Messenger (Sallallaahu 'alaihi wasallam) as saying: 

"The acts most pleasing to Allah are those which are done continuously, even if they are small. and when 'A'isha (RadiAllahu 'anha) did any act she did it continuously.  

[Sahih Muslim - Book 4, Hadith 1713]