“The attempt of Lavoisier to reform chemical nomenclature is premature. One single experiment may destroy the whole filiation of his terms; and his string of sulphates, sulphites, and sulphures, may have served no end than to have retarded the progress of science by a jargon, from the confusion of which time will be requisite to extricate us.” 

“This is our time, to put our people back to work and open doors of opportunity for our kids; to restore prosperity and promote the cause of peace; to reclaim the American dream and reaffirm that fundamental truth, that, out of many, we are one; that while we breathe, we hope. And where we are met with cynicism and doubts and those who tell us that we can't, we will respond with that timeless creed that sums up the spirit of a people: Yes, we can.”

“Happiness does not depend on outward things, but on the way we see them.”

“To doubt is to think, and thought is the only thing in the universe whose existence cannot be denied, because to deny is to think.”

“Provided that any of those neighbours sing out of tune or have boots that squeak, or double chins, or odd clothes, the patient will quite easily believe that their religion must therefore be somehow ridiculous.”

“You just need to be positive, believe in yourself, and focus on others.” 

“That ideas should freely spread from one to another over the globe, for the moral and mutual instruction of man, and improvement of his condition, seems to have been peculiarly and benevolently designed by nature, when she made them, like fire, expansible over all space, without lessening their density in any point, and like the air in which we breathe, move, and have our physical being, incapable of confinement or exclusive appropriation. Inventions then cannot, in nature, be a subject of property.”

“Submit to death, death of your ambitions and favorite wishes every day and death of your whole body in the end: submit with every fiber of your being, and you will find eternal life. Keep back nothing. Nothing that you have not given away will be really yours. Nothing in you that has not died will ever be raised from the dead. . . look to Christ and you will find Him, and with Him everything else thrown in.”

“I've heard that hard work never killed anyone, but I say why take the chance?”

“Government does not solve problems. It subsidizes them.”

“¡YO DECLARO que tendré fe en vez de tener miedo! Meditaré en lo que es positivo y bueno de mi situación, y usaré mi energía no para preocuparme, sino para creer.”

“All change is from the inner to the outer. All change begins in the self-concept. You must become the person you want to be on the inside before you see the appearance of this person on the outside.”

“I am fundamentally an optimist. Whether that comes from nature or nurture, I cannot say. Part of being optimistic is keeping one's head pointed toward the sun, one's feet moving forward. There were many dark moments when my faith in humanity was sorely tested, but I would not and could not give myself up to despair. That way lays defeat and death.”

“Slavery is founded in the selfishness of man's nature, opposition to it in his love of justice. These principles are an eternal antagonism, and when brought into collision so fiercely as slavery extension brings them, shocks and throes and convulsions must ceaselessly follow.”

“Involuntarily it appeared to me that there, somewhere, was someone who amused himself by watching how I lived for thirty or forty years: learning, developing, maturing in body and mind, and how, having with matured mental powers reached the summit of life from which it all lay before me, I stood on that summit -- like an arch-fool -- seeing clearly that there is nothing in life, and that there has been and will be nothing. And he was amused... But whether that "someone" laughing at me existed or not, I was none the better off. I could give no reasonable meaning to any single action or to my whole life. I was only surprised that I could have avoided understanding this from the very beginning -- it has been so long known to all. Today or tomorrow sickness and death will come (they had come already) to those I love or to me; nothing will remain but stench and worms. Sooner or later my affairs, whatever they may be, will be forgotten, and I shall not exist. Then why go on making any effort?... How can man fail to see this? And how go on living? That is what is surprising! One can only live while one is intoxicated with life; as soon as one is sober it is impossible not to see that it is all a mere fraud and a stupid fraud! That is precisely what it is: there is nothing either amusing or witty about it, it is simply cruel and stupid.”