The waiting that it spoken about, is not just sitting and weeping! We must prepare ourselves to 

(become the soldiers of Imam Mahdi (PBUH

Awaiting for Faraj [the coming of Imam Mahdi] means to be prepared completely for the goal 

...for which Imam Mahdi (PBUH) will rise up. That great historical revolution

Supreme Leader 81/7/30 - 87/5/27