The pendulum of the mind alternates between sense and nonsense, not between right and wrong.
— Carl Jung

Ideas came with explosive immediacy, like an instant birth. Human thought is like a monstrous pendulum; it keeps swinging from one extreme to the other.
Eugene Field pendulum quote

The pendulum is swinging back to the HD-DVD camp.
— John Freeman

Opinion is like a pendulum and obeys the same law. If it goes past the centre of gravity on one side, it must go a like distance on the other; and it is only after a certain time that it finds the true point at which it can remain at rest.
— Arthur Schopenhauer

History has always been a series of pendulum swings, but the individual doesn't have to get caught in that.
— Robert Johnson