“One is happy once one knows the necessary ingredients of happiness: simple tastes, a certain degree of courage, self denial to a point, love of work, and above all, a clear conscience.”

“One is happy as a result of one's own efforts once one knows the necessary ingredients of happiness: simple tastes, a certain degree of courage, self denial to a point, love of work, and above all, a clear conscience.”

“There is only one way to achieve happiness on this terrestrial ball, and that is to have either a clear conscience or none at all.”

“All happiness depends on courage and work.”

“The happiness of one's own heart alone cannot satisfy the soul; one must try to include, as necessary to one's happiness, the happiness of others.”

“There is a common tendency to turn off one's imagination at certain points and refuse to contemplate the possibility of having to do certain things and cope with the attendant moral problems. The things simply get done by the social machine, and one can keep one's clear conscience and one's moral indignation unsullied.”