Who is this person?

[David Lockmiller]

Who was the United States Supreme Court Justice who wrote the following statement regarding President Abraham Lincoln in the epilogue of his Supreme Court memoir?

An Illinois lawyer named Abraham Lincoln shared Cephalus's thoughts about justice and my views about sovereign immunity. In his State of the Union message of 1861, he said: "It is as much the duty of Government to render prompt justice against itself, in favor of its citizens, as it is to administer the same between private individuals."

Regarding Cephalus's thoughts about justice, the Supreme Court Justice in question wrote the following on the previous page of his epilogue: "A serene and elderly gentleman named Cephalus accepted Socrates' suggestion that justice consisted of speaking the truth and paying one's debts."

As usual, "No Googling" please.