"In my opinion it will not cease until a crisis shall have been reached and passed. 'A house divided against itself cannot stand.' I believe this government cannot endure permanently, half slave and half free. I do not expect the Union to be dissolved,—I do not expect the house to fall; but I do expect it will cease to be divided. It will become all one thing, or all the other. Either the opponents of slavery will arrest the further spread of it, and place it where the public mind shall rest in the belief that it is in the course of ultimate extinction; or its advocates will push it forward till it shall become alike lawful in all the States, old as well as new, North as well as South."
The above graph shows the frequency of the most common outlier words used by Lincoln in his speeches. These are words that appeared in his 100 most used words list, but not in the list of 100 most used words in the English language. We see words like "slavery," "states," and "right" were especially common because many of these speeches from Lincoln took place during the civil war. We also see that words like "upon" and "should" were especially common in Lincoln's speeches.
The above graph shows the overall frequency of the most common English words as opposed to their frequency in Lincoln's speeches. We see that the words "and," "to," "I," "it," and "be" are much more frequent in Lincoln's speeches than in general language. We also see that the word "she" is almost never used by Lincoln. Other than that, none of these results are especially surprising.