Best servants
A person asked Imam Reza (A.S.) "Who are the best of servants?
So he responded "Those men that when they perform good deed they become glad & when they perform a bad deed they ask the forgiveness (of Allah) & when they are granted they thank (for it). And while they get afflicted & grieved they exercise patience. And when they get enraged & angry they forgive. (Overlook other faults).
(Tuhful Aqool, P 445)
other links:
heaven
Worst of the people
Victory without sins