From The Creed of the Church of Scientology, 1954:

We of the Church believe … that all men have inalienable rights to think freely, to talk freely, to write freely their own opinions and to counter or utter or write upon the opinion of others…

From LRH Essay on Integrity:

Personal integrity is knowing what you know – what you know is what you know – and to have the courage to know and to say what you have observed. And that is integrity.

From The Phoenix Lectures, 1954:

[People] learn to keep their mouths shut, and it’s the wrong lesson. When in doubt, talk. When in doubt, communicate… you’ll be very successful all the way along the line if you just remember that.

From HCO PL 8 February 1960 Honest People Have Rights, Too (OEC Vol. 0, p. 461)

:

What would happen if all men were free enough to speak?  Then and only then would you have freedom.

Excerpt from London Congress, TRUTH AND FREEDOM 23 June 1960:

There is no slightest advantage in getting somebody to believe some fundamental truth uninspected. …and when he can inspect without fear, he can know the truth of things.  And the odd part of it is that once you know the truth of something, it can’t bite…

Precept # 7 The Way To Happiness:

Seek To Live With The Truth.  False data can cause one to make stupid mistakes.  It can block one from absorbing true data.