FTP, name this 1895 book of poetry by Stephen Crane.
In one section of this work, an angel advises a man to live as the puppies and lambkins do.  In another section, the ocean sees a woman weeping on the shore and divulges that he weeps too when the bustling fates heap his hands with corpses.  In the 29th section, a spirit returns from the land of the farther suns to find himself in a "reptile-swarming place."  In the final section, a spirit goes through spaces of night and valleys of black death-slime calling for God, only to be killed by a "sword from the sky" after denying the existence of a deity.  More famous are the first section, in which the titular figures "came from the sea" with "clang and clang of spear and shield," and the third, in which a naked and bestial creature is observed squatting in the desert and eating his heart, which he likes because it is bitter and because it is his heart.  FTP, name this 1895 book of poetry by Stephen Crane.
In one section of this work, an angel advises a man to live as the puppies and lambkins do.  
The Black Riders and Other Lines