Shah Wali Ullah has observed: "Chivalry and strength of character, humanity and sincerity which are attributes of great men were represented in abundance by Ali. He is the father of Islamic learning, and his intellectual attainments were due to the ideal training of The Holy Prophet. He was a Hafiz, and a great authority on the Quran. He was the greatest Mujahid and jurist of his time, and one of the greatest of all times. He was one of the greatest orators of early Islam."
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari