Heresy is another word for freedom of thought.

Graham Greene

They that approve a private opinion, call it opinion; but they that dislike it, heresy; and yet heresy signifies no more than private opinion.

Thomas Hobbes

There is no worse heresy than that the office sanctifies the holder of it.

Lord Acton

Holding absolute power is heresy in Islam.

Ayatollah Ali Khamenei

The administration has said some things in this that six months ago would have been heresy.

Robert Einhorn