In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Saeed Ibn Mansoor said: Hazm reported to us, saying: I heard katheer Ibn Ziyaad asking Al-Hasan about the statement of Allaah (The Most High): [رَبَّنَا هَبۡ لَنَا مِنۡ أَزۡوَٲجِنَا وَذُرِّيَّـٰتِنَا قُرَّةَ أَعۡيُنٍ۬]  “Our Lord! Bestow on us from our wives and our offspring who will be the comfort of our eyes”, saying: O Abu Saeed! What is this comfort of the eyes; is it in this worldly life or the afterlife? He (Al-Hasan) said: No, rather- by Allaah- it is in this world. He (katheer) said: What is it? He (Al-Hasan) said: By Allaah it is (when) Allaah causes a slave to see (deeds) of obedience to Allaah from his wife, brother and close friend. By Allaah there is nothing more beloved to a Muslim than seeing his (or her) child, or father or a close friend being obedient to Allaah [The Mighty and Majestic]. 
Surah Al-Furqaan. 74;  Fathul Baari 8/491. At-Tabari 19/318.