BEIRUT, Lebanon — Workmen are laying fresh bricks on balconies shattered by last week’s car bomb in a Hezbollah stronghold here, and there are frequent rallies at the site to keep residents’ spirits up. A bride and groom in their wedding finery dropped by the other night to reinforce the message that life must go on.

But some local residents do not fully share the public optimism of Hezbollah, the militant group and political party whose support for Damascus in Syria’s civil war is believed to have motivated the bombers. Many expect more attacks.

“When I leave the house, I say goodbye to my whole family, and when I leave work, I say goodbye to my colleagues,” said Farida Yacoub, 27, an engineer who lives nearby. “I might come back and I might not.”

The bombing, the deadliest in Lebanon in decades, killed 27 people, ravaged a neighborhood south of Beirut and served as a new and powerful reminder of how vulnerable the country is to spillover from the civil war in neighboring Syria. The fighting is so close, and the social and political ties between the two countries so strong, that echoes of the war resonate through many aspects of Lebanese life.