He covered his life with a veil

Young Adam was always an obedient child. Sometimes in him shrank from violence, from contention, from the silent shrieking tensions that can rip at a house. He contributed to the quiet he wished for by offering no violence, no contention, and to do this he had to retire into secretness, since there is some violence in everyone. He covered his life with a veil of vagueness, while behind his quiet eyes a rich full life went on. This did not protect him from assault but it allowed him an immunity.

—John Steinbeck, East of Eden (1952)