The individual sensibility gets transformed into an inclusive consciousness in the writings of Walt Whitman. How to escape the prison of the self and cultivate simultaneously self-consciousness and sympathy, using the sense of self-identity as a means of projecting oneself into the identity of others- that is Whitman’s valuable legacy to modern literature. Whitman seeks for the spiritual realism in his several poetic literary works. Whitman’s work was larger than the man. Although Whitman regarded himself as the poet of his own age and his native America, there are poems which are so representative of human nature and universal appeal in all ages that they assume worldwide significance also. The current study deals with the mystic ideas of Whitman, especially with a critical overview of the mysticism in his most celebrated poem Leaves of Grass.