One Love seems to be about Selassie, and Bob Marley as well as the quest for truth and strength among the people of Rastafari and Africa as their homeland.
The lion is the central figure for Selassie and thus the people of Rasta. Many pictures depict this connection. Bob Marley (a Rastafarian) first brought the song and phrase "One Love" into the world's consciousness. It promoted peace, love and understanding of all, and indeed spoke to a higher ground and truth before the light.