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Sometimes saying nothing at all says everything. Could Prime Minister Benjamin Netanyahu’s recent radio silence on Iran be the calm before the storm?

Netanyahu is not usually a tightlipped politician, especially when it comes to topics he loves talking about. But during the last few days, the prime minister has become taciturn. He still likes to talk, but, strangely, he’s been avoiding controversial issues, especially his favorite topic: the Iranian threat. During a 30-minute speech Sunday night, when he had the ear of the local and international press, along with that of the world’s Jewish movers and shakers, he barely brushed against Mahmoud Ahmadinejad and his nuclear program.

“We face four great challenges,” he said at the annual...