During an interview on Dec. 6, 2011 Leader Nasrallah said that  The resistance is using this period to prepare, to train, to strengthen capabilities, and the enemy itself can attest to this.
We will never let go of our arms, our members are increasing day after day, and we are getting better and our training is becoming better and we are becoming more confident in our future and more armed. And if someone is betting that our weapons are rusting, we tell them that every weapon that rusts is replaced.”

In the latest report of the New York Times, former Israeli Brigadier General and a military strategist discuss the advanced capabilities of Hezbollah, which might put on edge the Israeli army.

During the 2006 war, Hezbollah fired roughly 4,000 rockets, said Assaf Orion, a retired Israeli brigadier general.

The group could now likely fire just as many, including heavy missiles that cause serious damage, all over Israel within only a day, he added.

Brig. Gen. Shlomo Brom, a former top Israeli military strategist, said the sheer number of munitions in Hezbollah’s arsenal — particularly its cache of drones — could overwhelm Israel’s formidable aerial defenses in the event of a full-scale war. Hezbollah’s troops are also experienced fighters;

Source

New York Times interview with Leader Nasrallah

New York Times report with Israeli officials