Of the 14 people hurt in the attack, five remained in a hospital in good condition Wednesday, including two previously listed as critical, according to Kathryn Klein, a spokeswoman at the Memorial Hermann Texas Trauma Institute.
The sheriff's office said Quick told them he had fantasized about stabbing people to death since elementary school and had planned the attack for some time.
But Michael Lincoln, who lives next door, said Quick had never been aggressive, making the accusations even more shocking.
"If he's outside, he speaks to me, 'Hey neighbor, how you doing?'" Lincoln said.
Elva Garcia, 46, who lives two houses down from the Quicks, described him as a nice young man who stayed out of trouble and only came outside with his parents. She saw him, she said, just this past weekend, working with his parents in the front yard.
"We can't even believe it. What motive would he have?" Garcia said.
The attack came three months after a different Lone Star campus was the site of a shooting in which two people were hurt. The suspected gunman in that incident is charged with aggravated assault.
Associated Press writers Nomaan Merchant, Terry Wallace and David Warren in Dallas contributed to this report.