Explain this!
"It is very wrong to kill any one," said Virginia, who at times had a sweet puritan gravity, caught from some old New England ancestor'
What is puritan gravity here?

'Puritan' refers to a person who has strict views of how one must control oneself and work hard. They had intense and strict religious principles. 'Gravity' means seriousness. Virginia firmly believed that under all circumstances it was incorrect to kill anyone when she chided the ghost of Sir Simon for having killed his wife.