There may sometimes be ungenerous attempts to keep a young man down; and they will succeed too, if he allows his mind to be diverted from its true channel to brood over the attempted injury. Cast about, and see if this feeling has not injured every person you have ever known to fall into it.
Abraham LincolnSlavery is founded on the selfishness of man's nature - opposition to it on his love of justice. These principles are in eternal antagonism; and when brought into collision so fiercely as slavery extension brings them, shocks and throes and convulsions must ceaselessly follow.
Abraham LincolnI believe each individual is naturally entitled to do as he pleases with himself and the fruit of his labor, so far as it in no wise interferes with any other mans rightsthat each community, as a State, has a right to do exactly as it pleases with all the concerns within that State that interfere with the right of no other State, and that the general government, upon principle, has no right to interfere with anything other than that general class of things that does concern the whole.
Abraham Lincoln