Fellow Lincoln cabinet member John Palmer Usher later wrote that Stanton “. . . was devoted to the cause he was striving to serve and gave all his energies to it. Night after night he remained in his office until a late hour and sometimes until daylight; not infrequently would his carriage be found standing at the door waiting for him when daylight came.” Stanton aide Albert E. H. Johnson recalled: “While President Lincoln in everything he did or said was to one purpose, the exercise of power within the scope of the constitution, Mr. Stanton was for saving the Union whether the constitution was saved or not, since war with him could brook no hampering or limiting bounds, and as he said, to save the constitution at the expense of the Union, would only result in destroying both. This point of view also greatly illustrated one of the many differences between the two men, Lincoln, having a heart greater than his head — the other, Stanton, having a head greater than his heart."
The Lincoln-Stanton partnership was an awkward one. “No two men were ever more utterly and irreconcilably unlike,” one of Stanton’s aides recalled decades after the Civil War. Historian Doris Kearns Goodwin wrote: “The secretiveness which Lincoln wholly lacked, Stanton had in marked degree; the charity which Stanton could not feel, coursed from every pore in Lincoln. Lincoln was for giving a wayward subordinate seventy times seven chances to repair his errors; Stanton was for either forcing him to obey or cutting off his head without more ado. Lincoln was as calm and unruffled as the summer sea in moment of the gravest peril.; Stanton would lash himself into a fury over the same condition of things. Stanton would take hardships with a groan. Lincoln would find a funny story to fit them. Stanton was all dignity and sternness, Lincoln all simplicity and good nature.”