Widely considered the most influential popular song in Jamaican music history, this is a plaintive, “unplugged” recording by Bob Marley, singing about what freedom means to him. This makes the 1980 song more of a spiritual, than reggae, while freedom, also known as liberty, is a bedrock concept of political philosophy.
Freedom is typically split into two kinds, positive (the freedom to do) and negative (freedom from). The lyrics appear to reference black slavery, a severe restriction on individual positive liberty, but take it deeper to be about a freedom we may lack internally, in our minds. It can be faith that frees us, but also to seek solace in a world in which threats, be they racism or atomic bombs, are ever present.