Rosenzweig, as is well known, wrote much of The Star Redemption in installments on trains, in hospitals, in Serbia and in Macedonia (where FR served in an antiaircraft unit), which he sent to the Rosenstocks. Reminiscing about the composition of the Star, Rosenstock comments:
His soul and his mind left his body behind and never fully took possession of it all again. His suffering from the atrophy of all his muscles and the writing of the Star in complete ecstasy–with no correction, in one white heat–were two aspects of one and the same process.
Perverse Egalitarianism 
I don’t follow. How did he both write it in installments and write it in one white heat?