Integrity is the ability to stand by an idea.

A house can have integrity, just like a person

Achievement of your happiness is the only moral purpose of your life, and that happiness, not pain or mindless self-indulgence, is the proof of your moral integrity, since it is the proof and the result of your loyalty to the achievement of your values.

Integrity is not a conditional word. It doesn't blow in the wind or change with the weather. It is your inner image of yourself, and if you look in there and see a man who won't cheat, then you know he never will. Integrity is not a search for the rewards of integrity. Maybe all you ever get for it is the largest kick in the ass the world can provide. It is not supposed to be a productive asset.

A house can have integrity, just like a person,' said Roark, 'and just as seldom.

Only a man of integrity can possess the virtue of honesty, since only the faking of one’s consciousness can permit the faking of existence.