The Prophet (sallal-laahu-alayhi-wasallam) said:

”The Most beloved deeds to Allaah are that which (a person does) continuously even if little”. [Ref 1]

Short Faa’idah from Imaam Abdul Azeez Bin Baaz (rahimahullaah):

Righteous deeds (i.e. supererogatory deeds) -even if little- performed regularly are better than performing a lot of deeds that are not regular. [Ref 2]

Faa’idah from Shaikh Muhammad Baazmool (may Allaah preserve him):

The hadeeth shows that a Muslim should limit himself to the acts of worship he is able perform (i.e. supererogatory deeds) and what is understood from this is a prohibition against imposing on himself (supererogatory deeds) which he is not able to perform. [Ref 3:]

[Ref 1: Part of a Hadeeth in Sahih Muslim Number 782]

[Ref 2: Al-Hulalul Ibreeziyyah Min At-Taleeqaat Al-Baaziyyah Alaa Saheeh Al-Bukhaari. Vol 1 footnote number 2. Page 24. Abridged & slightly paraphrased]

[Ref 3: Bugh’yah Al-Muta’tawwi Fee Salaah At-Tatawwu’ page198. Abridged & slightly paraphrased]