Everyone pretends to be 'free thinkers', but few individuals pass the line into expressive territories that may be detrimental to their own social well-being.
A man's ethical behaviour should be based effectually on sympathy, education, and social ties and needs; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death.
We speak not only to tell other people what we think, but to tell ourselves what we think. Speech is a part of thought.