“Tact is the ability to describe others as they see themselves.”

“I may be wrong in regard to any or all of them; but holding it a sound maxim, that it is better to be only sometimes right, than at all times wrong, so soon as I discover my opinions to be erroneous, I shall be ready to renounce them.”

“Although volume upon volume is written to prove slavery a very good thing, we never hear of the man who wishes to take the good of it, by being a slave himself.”

“Folks are usually about as happy as they make their minds up to be.”

“Commitment is what transforms a promise into reality.”

“Let [the Constitution] be taught in schools, in seminaries, and in colleges, let it be written in primers, in spelling books and in almanacs, let it be preached from the pulpit, proclaimed in legislative halls, and enforced in courts of justice. And, in short, let it become the political religion of the nation.”

“This is a world of compensation; and he who would be no slave must consent to have no slave. Those who deny freedom to others deserve it not for themselves, and, under a just God, cannot long retain it.”

“Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in liberty and dedicated to the proposition that all men are created equal. Now we are engaged in a great civil war, testing whether that nation or any nation so conceived and so dedicated can long endure. We are met on a great battlefield of that war. We have come to dedicate a portion of that field as a final resting-place for those who here gave their lives that that nation might live. It is altogether fitting and proper that we should do this. But in a larger sense, we cannot dedicate, we cannot consecrate, we cannot hallow this ground. The brave men, living and dead who struggled here have consecrated it far above our poor power to add or detract. The world will little note nor long remember what we say here, but it can never forget what they did here. It is for us the living rather to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to be here dedicated to the great task remaining before us — that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion — that we here highly resolve that these dead shall not have died in vain, that this nation under God shall have a new birth of freedom, and that government of the people, by the people, for the people shall not perish from the earth.” 

“Always bear in mind that your own resolution to succeed is more important than any one thing.”

“Upon the subject of education, not presuming to dictate any plan or system respecting it, I can only say that I view it as the most important subject which we as a people can be engaged in.”

“My earlier views of the unsoundness of the Christian scheme of salvation and the human origin of the scriptures have become clearer and stronger with advancing years, and I see no reason for thinking I shall ever change them.”

“In regards to this great Book [the Bible], I have but to say it is the best gift God has given to man. All the good the Savior gave to the world was communicated through this Book. But for it we could not know right from wrong. All things most desirable for man's welfare, here and hereafter, are found portrayed in it.”

“All I have learned, I learned from books.”

“I care not for a man's religion whose dog and cat are not the better for it.”

“Must is the word... You can not fail if you resolutely determine that you will not... Always bear in mind that your resolution to succeed is more important that any other thing.”