He never felt lonliness except when he was happy.

A chronic lack of pleasure, of any enjoyable, rewarding or stimulating experiences, produces a slow, gradual, day-by-day erosion of man's emotional vitality, which he may ignore or repress, but which is recorded by the relentless computer of his subconscious mechanism that registers an ebbing flow, then a trickle, then a few last drops of fuel--until the day when his inner motor stops and he wonders desperately why he has no desire to go on, unable to find any definable cause of his hopeless, chronic sense of exhaustion.

I think it's funny. There was a time when men were afraid that somebody would reveal some secret of theirs that was unknown to their fellows. Nowadays, they're afraid that somebody will name what everybody knows. Have you practical people ever thought that that's all it would take to blast your whole, big, complex structure, with all your laws and guns - just somebody naming the exact nature of what you're doing?

Happiness is that state of consciousness which proceeds from the achievement of one's values.

Their eyes were dark and hard and glowing, with no fear in them, no kindness and no guilt.

"Mediocrity" doesn't mean average intelligence, it means an average intelligence that resents and envies its betters.

About Mike the construction worker, friend of Roark: "He worshipped expertness of any kind. He loved his work passionately and had no tolerance for anything save for other single-track devotions. He was a master in his own filed and felt no sympathy except for mastery. His view of the world was simple: there were the able and there were the incompetent; he was not concerned with the latter."