Freedom of thought (also called freedom of conscience and freedom of ideas) is the freedom of an individual to hold or consider a fact, viewpoint, or thought, independent of others' viewpoints. It is closely related to, yet distinct from, the concept of freedom of expression.[citation needed] To deny a person's freedom of thought is to deny what can be considered one's most basic freedom; to think for one's self. Since the whole concept of 'freedom of thought' rests on the freedom of the individual to believe whatever one thinks is best (freedom of belief), the notion of 'freedom of religion' is closely related and inextricably bound up with these[citation needed].
While in many societies and forms of government, there has been effectively no freedom of religion or belief, this same freedom has been cherished and developed to a great extent in the modern western world, such that it has often been taken for granted.