And they were not commanded except to worship Allah, being sincere to Him in obedience, upright, and keep up prayer and pay the Zakaah, and that is the right religion.
[Qur'aan 98:5]
Narrated Abu Hurairah (may Allaah be pleased with him) that the Messenger of Allaah (sallallaahu alayhi wa sallam) said:
Indeed, there was a man who had never done any good but he would lend to people and say to his messenger: Take that which can easily be paid back and leave what is difficult. And let them off (in hope that) perhaps Allaah will let us off.
When he died, Allaah said: Have you ever done any good?
He said: No, except that I had a young lad, and I used to lend to people. When I sent him to collect the debts, I would say to him: Take what can be paid back easily and let go of that which is difficult. And let them off (in hope that) perhaps Allaah will let us off.
Allaah said: I have let you off
Sunan al-Nasaa'i Hadiith No. 4694
This hadiith shows the importance of sincerity. It shows how important ikhlaas is in our deeds. We must do everything only for the Sake of Allaah alone.
Even a small deed, when done with sincerity, can be sufficient to save us from the Fire.
Abu Huraira reported Allah's Messenger (sallallaahu alayi wa sallam) as saying:
No one gives Sadaqa of a date out of his honest earning, but Allah accepts it with His Right Hand, and then fosters it as one of you fosters the colt or a young she-camel, till it becomes like a mountain or even greater.
Sahiih Muslim Hadiith No. 1014
Narrated `Aisha:
The most beloved action to Allah's Messenger (sallallaahu alayhi wa sallam) was that whose doer did it continuously and regularly.
Sahiih al-Bukhaari Hadiith No. 6462
Do not aim for quantity. Aim for quality.
Make sure every deed you do is done with utmost sincerity to please Allaah only.
Then, even your small deeds will bring you massive dividends.