But I’ve suddenly changed my mind and turned more optimistic about our — Max Tegmark

"(…) the bottom line is that if you believe in an external reality independent of humans, then you must also believe that our physical reality is a mathematical structure. Nothing else has a baggage-free description. In other words, we all live in a gigantic mathematical object—one that’s more elaborate than a dodecahedron, and probably also more complex than objects with intimidating names such as Calabi-Yau manifolds, tensor bundles and Hilbert spaces, which appear in today’s most advanced physics theories. Everything in our world is purely mathematical—including you."

"Here... is the Schrödinger equation [i \hbar \frac{d}{d t}\vert\Psi(t)\rangle = \hat H\vert\Psi(t)\rangle]... and what its actually saying is that the state of the world, thats this Greek letter Ψ there with the bracket around it... Its saying that the rate of change of it... depends on the current state of the world, when you do this operation on it and for the math nerds, this is a linear operation... and what that just means is, as Everett has pointed out and many others have known for a very long time is that, in some circumstances, two different solutions to this can do their parallel thing. We can talk at... length about the discoveries... about decoherence and why it is that sometimes these different parallel branches are unaware or each other, but my point is... if you give a science nerd colloquium... at a physics department... ideally, you should also start in the same way you start discussing this with your grandma. Just at a very high level... here are the cool ideas, and then you can go as deep as the audience or the listener wants, from there."

"(…) no spectator is needed, because your consciousness basically is your reality model. I think that consciousness is the way information feels when being processed in certain complex ways. Since the different parts of your brain interact with each other, different parts of your reality model can interact with each other, so the model of you can interact with your model of the outside world, giving rise to the subjective sensation of the former perceiving the latter."

"Evolution endowed us with intuition only for those aspects of physics that had survival value for our distant ancestors, such as the parabolic orbits of flying rocks (explaining our penchant for baseball). A cavewoman thinking too hard about what matter is ultimately made of might fail to notice the tiger sneaking up behind and get cleaned right out of the gene pool. Darwin’s theory thus makes the testable prediction that whenever we use technology to glimpse reality beyond the human scale, our evolved intuition should break down. We’ve repeatedly tested this prediction, and the results overwhelmingly support Darwin. At high speeds, Einstein realized that time slows down, and curmudgeons on the Swedish Nobel committee found this so weird that they refused to give him the Nobel Prize for his relativity theory. At low temperatures, can flow upward. At high temperatures, colliding particles change identity; to me, an electron colliding with a and turning into a Z-boson feels about as intuitive as two colliding cars turning into a cruise ship. On microscopic scales, particles schizophrenically appear in two places at once, leading to the quantum conundrums... On astronomically large scales... weirdness strikes again: if you intuitively understand all aspects of black holes... put down this book and publish your findings before someone scoops you on the Nobel Prize for quantum gravity… [also,] the leading theory for what happened [in the early universe] suggests that space isn’t merely really really big, but actually infinite, containing infinitely many exact copies of you, and even more near-copies living out every possible variant of your life in two different types of parallel universes."

"... I would rather have questions that I cant answer than answers that I cant question. (variation of a remark by Richard Feynman)"

"Eratosthenes... knew that the Sun was straight overhead in... Syene at noon on the summer solstice, but that it was 7.2 degrees south of straight overhead in , located 794 kilometers farther north. He concluded... 794 kilometers corresponded to 7.2 degrees out of the 360 degrees... around Earths circumference, so that the circumference must be... 39,700 km..."

"In the life of the mass-order, the culture of the generality tends to conform to the demands of the average human being. Spirituality decays through being diffused among the masses when knowledge is impoverished in every possible way by rationalisation until it becomes accessible to the crude understanding of all."

"The first thing I remember about the world — and I pray that it may be the last — is that I was a stranger in it. This feeling, which everyone has in some degree, and which is, at once, the glory and desolation of homo sapiens, provides the only thread of consistency that I can detect in my life."

"Jewish custom, which traces descent solely from the mother, is more sensible and more discreet. Our own lawgivers cant accept the fact that there are many things in family life that are best kept shrouded in mystery."

"One makes mistakes; that is life. But it is never a mistake to have loved."

"If it fulfills our hopes, this center will be, at once, a symbol and a reflection and a hope. It will symbolize our belief that the world of creation and thought are at the core of all civilization. Only recently in the White House we helped commemorate the 400th anniversary of Shakespeare. The political conflicts and ambitions of his England are known to the scholar and to the specialist. But his plays will forever move men in every corner of the world. The leaders that he wrote about live far more vividly in his words than in the almost forgotten facts of their own rule. Our civilization, too, will largely survive in the works of our creation. There is a quality in art which speaks across the gulf dividing man from man and nation from nation, and century from century. That quality confirms the faith that our common hopes may be more enduring than our conflicting hostilities. Even now men of affairs are struggling to catch up with the insights of great art. The stakes may well be the survival of civilization. The personal preferences of men in government are not important--except to themselves. However, it is important to know that the opportunity we give to the arts is a measure of the quality of our civilization. It is important to be aware that artistic activity can enrich the life of our people, which really is the central object of Government. It is important that our material prosperity liberate and not confine the creative spirit."

"I did not go to join Kurtz there and then. I did not. I remained to dream the nightmare out to the end, and to show my loyalty to Kurtz once more. Destiny. My destiny! Droll thing life is — that mysterious arrangement of merciless logic for a futile purpose. The most you can hope from it is some knowledge of yourself — that comes too late — a crop of unextinguishable regrets. I have wrestled with death. It is the most unexciting contest you can imagine. It takes place in an impalpable grayness, with nothing underfoot, with nothing around, without spectators, without clamor, without glory, without the great desire of victory, without the great fear of defeat, in a sickly atmosphere of tepid skepticism, without much belief in your own right, and still less in that of your adversary. If such is the form of ultimate wisdom, then life is a greater riddle than some of us think it to be. I was within a hairs-breadth of the last opportunity for pronouncement, and I found with humiliation that probably I would have nothing to say. This is the reason why I affirm that Kurtz was a remarkable man. He had something to say. He said it. Since I had peeped over the edge myself, I understand better the meaning of his stare, that could not see the flame of the candle, but was wide enough to embrace the whole universe, piercing enough to penetrate all the hearts that beat in the darkness. He had summed up — he had judged. The horror! He was a remarkable man. After all, this was the expression of some sort of belief; it had candor, it had conviction, it had a vibrating note of revolt in its whisper, it had the appalling face of a glimpsed truth — the strange commingling of desire and hate."