Purring would seem to be, in her case, an automatic safety valve device for dealing with happiness overflow.
The unproductive tillage of human cattle takes that which of right belongs to free labor, and which is necessary for the support and happiness of our own race.
I can only point out a curious fact. Year after year the Nobel Awards bring a moment of happiness not only to the recipients, not only to colleagues and friends of the recipients, but even to strangers.
The principles we live by, in business and in social life, are the most important part of happiness.