Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "If you were to realize the vastness of Allah Almighty's mercy, you would rely (on it and sit back and) not perform any deeds; and if you were to realize the extent of His wrath, (you would think that) no deed would benefit you."