Imam Ali (as) said: "Experience suffices as a trainer." Ghurar al-hikam, hadith no. 7016.

Imam Ali (as) said: "Avoid dispute, for it brings about doubt." al-Khisal, p 615, hadith no. 10.

Imam Ali (as) said: "Sheer cowardice ensues from the impotence of the soul and the weakness of conviction."Ghurar al-hikam, hadith no. 5773.

Imam Ali (as) said: "Whoever acts tyrannically will be broken." Ghurar al-hikam, hadith no. 7697.

Imam al-Baqir and Imam al-Sadiq (as) said: "Allah, the Exalted, is too merciful to coerce His servants to sin and then punish them for it. He is also too mighty to want something and it not be accomplished." Then they were asked whether there is a stance between free will and predestination, to which they replied, "Yes, [a stance] wider than the space between the earth and the sky." al-Tawhid, p 360, hadith no. 3.

Imam Ali (as) said: "The reward for your work is better than your work itself." Ghurar al-hikam, hadith no. 4688

Imam Ali (as) said: "The one who procrastinates in repenting for himself faces the greatest danger from the [sudden] attack of death."  Ghurar al-hikam, hadith no. 9876

Imam Ali (as) said: "Remorse for a sin counts as seeking forgiveness." Ghurar al-hikam, hadith no. 1211

Imam Ali (as) "Whoever sells himself for [a price] less than Paradise, his ordeal is indeed severe." Ghurar al-hikam, hadith no. 3474.