If the universe is infinite patterns are bound to repeat over and over again.

I try to live my life on the basis of eternal return.

Eternal return (also known as "eternal recurrence") is a concept which posits that the universe has been recurring, and will continue to recur, in a self-similar form an infinite number of times across infinite time and/or infinite space. The concept initially inherent in Indian philosophy was later found in ancient Egypt, and was subsequently taken up by the Pythagoreans and Stoics. With the decline of antiquity and the spread of Christianity, the concept fell into disuse in the western world, though Friedrich Nietzsche resurrected it as a thought experiment to argue for amor fati.

In addition, the philosophical concept of eternal recurrence was addressed by Arthur Schopenhauer. It is a purely physical concept, involving no supernatural reincarnation, but the return of beings in the same bodies. Time is viewed as being not linear but cyclical.

The basic premise proceeds from the assumption that the probability of a world coming into existence exactly like our own is finite. If either time or space are infinite then mathematics tells us that our existence will recur an infinite number of times.

In 1871, Louis Auguste Blanqui, assuming a Newtonian cosmology where time and space are infinite proceeded to show that the eternal recurrence was a mathematical certainty.[1] In the post-Einstein period, there are doubts that time or space is in fact infinite, but many models exist which provide the notion of spatial or temporal infinity required by the eternal return hypothesis.

The oscillatory universe model in physics could be provided as an example of how the universe cycles through the same events infinitely. Stephen Hawking's concept "arrow of time", for example, discuss cosmology as proceeding up to a certain point, after which it undergoes a time reversal (which, as a consequence of T-symmetry, is thought to bring about a chaotic state due to entropy).[citation needed] Hawking and J. Richard Gott have also proposed models by which a/the universe could undergo time travel, provided the balance between mass and energy created the appropriate cosmological geometry.[citation needed]

Multiverse hypotheses in physics describe models where space and or time is infinite, although local universes with their own big bangs could be finite space-time bubbles.

The symbol of the Ouroboros, the snake or dragon devouring its own tail, is the alchemical symbol par excellence of eternal recurrence, possibly borrowed from the Norse concept of Jörmungandr or the Midgard Serpent. The alchemist-physicians of the Renaissance and Reformation were aware of the idea of eternal recurrence; the physician-philosopher Sir Thomas Browne in his A Letter to a Friend circa 1657 linked the Uroboros symbol with the idea of eternal return thus -

that the first day should make the last, that the Tail of the Snake should return into its Mouth precisely at that time, and they should wind up upon the day of their Nativity, is indeed a remarkable Coincidence, which tho Astrology hath taken witty pains to salve, yet hath it been very wary in making Predictions of it.

[T]ime is infinite, but the things in time, the concrete bodies, are finite. They may indeed disperse into the smallest particles; but these particles, the atoms, have their determinate numbers, and the numbers of the configurations which, all of themselves, are formed out of them is also determinate. Now, however long a time may pass, according to the eternal laws governing the combinations of this eternal play of repetition, all configurations which have previously existed on this earth must yet meet, attract, repulse, kiss, and corrupt each other again...[10]

Nietzsche calls the idea "horrifying and paralyzing",[citation needed] and says that its burden is the "heaviest weight" ("das schwerste Gewicht")[11] imaginable. The wish for the eternal return of all events would mark the ultimate affirmation of life:

My formula for human greatness is amor fati: that one wants to have nothing different, not forward, not backward, not in all eternity. Not merely to bear the necessary, still less to conceal it--all idealism is mendaciousness before the necessary--but to love it.

Related to the concept of eternal return is the Poincaré recurrence theorem in mathematics. It states that a system whose dynamics are volume-preserving and which is confined to a finite spatial volume will, after a sufficiently long time, return to an arbitrarily small neighborhood of its initial state. "A sufficiently long time" could be much longer than the predicted lifetime of the universe (see 1 E19 s and more).

[edit] Modern cosmology

Controversial theoretical physicist Peter Lynds suggested a model of eternal recurrence in a 2006 paper.[14] Lynds hypothesizes that if the universe undergoes a big crunch, the arrow of time may reverse. Others have approached the question of eternal recurrence from a physics perspective in different ways, including a hypothesis based on the transactional interpretation of quantum mechanics.[15] Other cosmologists such as Massachusetts Institute of Technology professor Max Tegmark consider the possibility that the known universe is just one of many in a multiverse, presenting the argument that existences identical to our own recur infinitely over infinite space.[16] Currently all recurring cosmological models are very controversial within the scientific community, especially due to the fact that there is no evidence to support them. Furthermore, several models proposed in the past have been refuted such as the bouncing model.[17]

http://en.wikipedia.org/wiki/Eternal_Return