What is the meaning of But only words can free a thought From its prison behind your eye?

The phrase "But only Words can free a thought from its prison behind your eye" suggests that thoughts, while internally conceived, can become trapped and unexpressed. Words serve as the vehicle for articulating these thoughts, allowing them to be shared and understood by others. This highlights the power of language in bridging the gap between personal internal experiences and external communication, ultimately liberating one's ideas.