(EEAR - 2019)
In the famous words by John Lennon: "You may say I'm a dreamer but I'm not the only one. I hope someday you'll join us and the world will be as one", the modal verb in bold indicates that:
He knew that he could dream about peace and try to help everybody.
He understood that he could be seen as a dreamer.
He was not able to dream about peace and love.
He considered himself the only dreamer.