There was specific constitutional provision for emergency measures in the case that Abraham Lincoln faced - an insurrection - which no other president has faced.

Abraham Lincoln had great clarity of mind and expression, and he worked to make it clearer -reading Euclid in his early 30s to train his mind.

After I published a book called Lincoln's Virtues a wit said that my next book should be Lincoln's Vices. But in my opinion that would be a short book!

The US did not have any big supply of good generals in Civil War, and some it did have went with the rebels. If Robert E.Lee had stayed with his country the story would have been different.

Abraham Lincoln had a deep realism; he did not deceive or mislead himself, but faced the world he had to deal with as it really is. At the same time, he had a striking moral intelligence, and a confidence in the working of his own mind and conscience.

Abraham Lincoln was not philosopher, exactly. But he did have a strong mind, which sought generalizations as well as particulars. He had a terrific memory.

Abraham Lincoln did not contend that his actions were immune from Congressional correction; on the contrary, he specifically said he was acting beyond the present provisions in the expectation that congress would retroactively approve, which they did. He did not say anything like Richard Nixon: if the president does it is legal.