Hello. You did not inform the poem to which this question refers, which makes it impossible for it to be answered. However, I will try to help you in the best possible way.
One of the most significant things when a black poet writes a poem, is that poet's ability to present a relevant literary work, which black artists were banned for many years ago. This becomes even more significant when these poets write about the problems of racism and social intolerance that blacks suffer from. This is because, the poet has property to talk about these subjects, since he goes through these problems and knows them in depth.
To me this quote means that all men lie about there promises. There deeds all are different.Just like there promises.Then when they have deeds theydont want to do them