Either a serious commitment to peaceful resolution of issues or war. Afterall, past truces have been grinding bit by bit war. This is what Hamas wants and is willing to pay the price in the form of some of its citizens. Obviously, when a "higher up" gets hurt or killed, well then it get too serious. Either war or peace.
Rocket alarm sirens sound in southern Israel (Haaretz)
from the article: Morsi's challenge: An Israel-Hamas truce