“Loneliness as a situation can be corrected, but as a state of mind it is an incurable illness.”

“The man dissatisfied with the world will be dissatisfied with himself, so as to be continually eaten up by his own ill humor. And in such a state of mind how can he retain health?”

“Just like those who are incurably ill, the aged know everything about their dying except exactly when.”

“What matters deafness of the ear, when the mind hears? The one true deafness, the incurable deafness, is that of the mind.”

“The mind does not regulate its own condition. Mental depression, for example, is a state of mind caused by the body. In a cell in the hole it only seems that there is a separation of mind and body - in fact, the body's condition (of deprivation of sensations; experiences, functions, and so on) controls the moods of the mind more than in any other situation I can think of.”

“Reasoning will never make a man correct an ill opinion, which by reasoning he never acquired…”

“… an optimistic mind-set finds dozens of possible solutions for every problem that the pessimist regards as incurable.”

“Better a man's own duty, though ill-done, than another's duty well-performed; if a man do the duty his own nature bids him, he incurs no stain.”

“Madness is an illness of the brain, not of the mind.”

“There’s a loneliness that only exists in one’s mind. The loneliest moment in someone’s life is when they are watching their whole world fall apart, and all they can do is blink.”