As Kerry has shuttled between Palestinian and Israeli leaders, seeking painful compromises from both sides, he has faced growing personal attacks portraying him as well-meaning but naive.
With few details emerging from his closely-guarded talks, both sides have vented their frustration in the media, flinging mud at the US secretary of state in a bid to ensure their point of view is heard.
But hardline Israeli Defense Minister Moshe Yaalon seems to have gone a step too far yesterday when he branded Kerry's quest an "incomprehensible obsession" and described him as a man with a "sense of messianism."