" It was easy to repossess imagination with false promises; much harder to do so with nuanced truths. It demanded an act of exquisite measuring and remeasuring, filling and unfilling a psychological respirator with oxygen. Too much "repossession" and imagination might bloat into delusion. Too little and it might asphyxiate hope altogether. "

― Siddhartha Mukherjee , The Emperor of All Maladies: A Biography of Cancer