The concept of sin was foreign to the Celts. Pelagius argued that through the exercise of free will, where people's choices were their own, people could be free of sin. For this heresy, St. Augustine initiated long arguments, condemnations and excommunications of Pelagius and his followers. Pelagius was excommunicated three times and set free each time. The Church didn't win the debate and the Celts held their position on this central philosophical point up until the 12th century.
Free speech is protected from government intervention.
Even the early Greeks didn't offer this breadth of personal freedom in their democracy. Socrates had to take hemlock as the remedy for the free speech of his adventurous spirit. It is a primal urge no matter how that is defined socially. Celtic people are all over the globe. Remember that the Celts were originally a migrating tribal culture unified by language and fundamental egalitarian philosophy.