“Do you know what the definition of insane is? Yes. It’s the inability to relate to another human being. It’s the inability to love.”

“That’s what I love you for: your inability to perceive all my hideous flaws.”

“Hell is the inability to love.”

“Never confuse someone else's inability to do something with its inability to be done.”

“Inability, human incapacity, is the only boundary to an art.”

“On Our Inability To Do Much.”

“The inability to predict outliers implies the inability to predict the course of history”

“I know now that what makes a fool is an inability to take even his own good advice.”

“Do you know the definition of insanity? Doing the same thing over and over and expecting different results."

"Wrong. That's the definition of determination.”

“I feel ceaselessly and increasingly torn, both in my intelligence and in the depth of my heart, by my inability to conceive simultaneously and in truth of the affliction of humans, the perfection of God, and the relation between the two.”