“A free man is he who does not fear to go to the end of his thought.”

this is a very true and meaningful quote!

I agree if that end does not infringe on another's right.

Variation: A religious free agent is one who is not afraid to think outside the box of his own theology.

Thought is always free - its not man's thought that makes him free its his ability to live freely without fear in the moment.

I think so, but to be free is more than being able to think freely -- even a prisoner may go to the end of his thoughts.