For indeed the same process, working more slowly but on identical lines, is constantly seen in the hardening effect of vicious habit.
"The Expositor's Bible: The Book of Exodus"
G. A. Chadwick
The King, accustomed to the dry African jungle, apparently suffered the least, but he began to be vicious.
"In Desert and Wilderness"
Henryk Sienkiewicz
This gave us courage to attack those more vicious but less dangerous animals, the bear and walrus.
"My Attainment of the Pole"
Frederick A. Cook