“Regret is an appalling waste of energy, and no one who intends to be a writer can afford to indulge in it.”

“Make it a rule of life never to regret and never to look back. Regret is an appalling waste of energy; you can't build on it; it's only good for wallowing in.”

“I have made it a rule of my life never to regret and never to look back. Regret is an appalling waste of energy... you can't build on it; it's only good for wallowing in.”

“The sad ones are those who waste their energy in trying to hold it back, for they can only feel bitterness in loss and no joy in gain.”

“To trust people is a luxury in which only the wealthy can indulge; the poor cannot afford it.”

“Smug respectability, like the poor, we've had with us always. Today, however, ... such obtuseness is an indulgence we can no longer afford. The computer, nuclear energy for better or worse, and sudden, simultaneous influences upon everyone's TV screen have raised the ante and the risk considerably.”