Search for Purpose, Healing Following Santa Barbara Rampage

Classes at the University of California, Santa Barbara are scheduled to resume today. But for the student body, things remain harrowing and unsettled following Friday's deadly rampage.

Thousands poured into the school's stadium Tuesday for a memorial remembering the six killed and 13 wounded during Elliot Rodger's deadly rampage.

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Janet Napolitano, University of California President and former U.S. Homeland Security Secretary spoke.

"All died much too young but it's important that we do not let the arithmetic of this atrocity define them," she said.

Each of the victims left a mark on the world and "as long as we hold them in our hearts, they are not gone," she said.

Richard Martinez, whose son, Christopher Michaels-Martinez, 20, died in Friday's attacks, urged students to fight for tougher gun laws.

"It's almost become a normal thing for us to accept this," he said, referring to mass-killings. "It's not normal ... life doesn't have to be like this."

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He got the crowd to repeatedly chant "Not one more," in reference to such massacres.

He also read statements from the families of two other slain students, Cheng Yuan Hong and Weihan Wang, both 20, in which they asked for prayers or blessings on the families of the victims and the killer.

Massive Crowd Comes to Mourn Santa Barbara Shooting Victims

"May we together create a peaceful world and let hatred be gone with the wind," the Hong family statement said.

The ceremony featured prayers, songs and displays of solidarity. Kristin Van Ramshorst, Director of Fraternities and Sororities at USCB, said the students have bonded amid the tragedy.

"We are here. We stand together," she said. "All of us here are supporting the Isla Vista community."

Earlier in the day, sorority members held hands outside the house where two of their sisters - Katherine Cooper and Veronika Weiss - were shot to death.

Inside Elliot Rodger's 'Twisted World'

So many questions remain following Friday's attacks, specifically whether anyone could have stopped Rodger from carrying out the plot he laid out in a 137-page manifesto called "My Twisted World." The document reflects his promise to take revenge on the women who he said rejected him.

The focus shifted to reflection and healing Tuesday. Two more weeks of school remain.

The Associated Press contributed to this report.