In 2010 I will turn 61 years old. Where has the time gone? And what, anyway, is "time?" Here's a review of some philosophical ideas about time. (Special thanks to Manuel Velazquez's excellent Philosophy: A Text With Readings, 11th edition)
PLATO (Ancient Greek philosopher, 429-347 BCE)
- "Time" exists independently of events that occur in time.
- "Time is like an empty container into which things and events may be placed; but it is a container that exists independently of what (if anything) is placed in it." (SEP)
ARISTOTLE (Ancient greek philosopher, 384-322 BCE)
- Time does not exist independently, contra Plato, of the events that occur in time.
- This view is called "Reductionism with Respect to Time."
- This means that "all talk that appears to be about time can somehow be reduced to talk about temporal relations among things and events." (SEP)
- The idea of a period of time without change is seens as incoherent.
- Thus "time" cannot exist independently of what is placed in it. Apart from events, no time exists.
- Time, in a sense, does not exist.
- The past no longer exists.
- The future does not yet exist.
- Only the present moment is real.
- But the present moment has, in itself, neither a past nor a future.
- The present moment is timeless.
- "Time," from God's perspective, is different from our perspective.
- God is outside of time.
- Time is like a line of events stretched out before God.
- Every moment - past, preent, and future - lies on this line. Everything on the "line of time" is fixed. This is God's perspective. (Cmp. C.S. Lewis who, in Mere Christianity, employed Augustine's view of time.)
- The flow of time as we experience it is unreal.
- "Time" is a fixed series of moments, each moment either "before" or "after" the other moments. This is "objective time."
- We can also think of "time" as a sequence of flowing moments. Each moment changes or flows from "future" to "present" to "past." This is "subjective time."
- "Past," "present," and "future" are incompatible with each other. Therefore it is impossible for the same thing (viz., the same "moment") to be simultaneously future, present, and past.
- But if time did "flow," then every moment would have to be future, and then present, and then past.
- So the idea of subjective time as a sequence of flowing moments is unreal.
- Subjective time is unreal. Out experience of time as "passing" is an illusion.
- Following this McTaggert said, "I believe that nothing that exists can be temporal, and that therefore time [subjective] is unreal." (The Nature of Existence)
- "Time" is an unchanging, fixed series of events frozen onto the "line of time" that makes up the series. But this is not really time, because there is no flow or change here. And, since subjective time is unreal, time cannot be real.
- Time - whether subjective or objective - is simply a construct of the human mind.
- "Time" and "space" are categories of the mind that the mind uses to organize the flow of changing sensations.
- Kant said, "Time is therefore given a priori." "Time" as a mental category is "prior to experience" and organizes or categorizes experience.
- Time is not real but is a mental construct.
- "Objective time," the "time" of the scientist, is just a conceptual abstraction, a construct of the mind.
- The image of time as a line is simply an image; the concept of objective time is only a concept. Neither images nor concepts can get at the reality.
- Only what we directly experience is real; viz., what we "intuit."
- We directly exeperience or intuit the flow of time. Bergson says we have the "intuition of duration."
- Real time is subjective time. This is the "flow of time" that I experience moving from future, through present, and into the past.
- Objective time is an intellectual reconstruction and thus is an illusion."Time" does not actually exist "out there" in the world (it's not a reality transcendent to human subjectivity).
- Apart from events time does not exist.
- Prior to creation time did not exist.
- A personal God need not experience a temporal succession of mental events. "God could know the content of all knowledge - past, present, and future - in a simultaneous and eternal intuition." (See Craig, "God, Time, and Eternity")
- "The proper understanding of God, time, and eternity would be that God exists changelessly and timelessly prior to creation and in time after creation."
- There are no "events" prior to creation. Therefore, since God exists prior to creation and is an "eventless" being, "time" does not exist prior to creation. At the creation of the unvierse time begins. On a relational view of time God now relates to the universe, "and God subjects himself to time by being related to changing things."
- Time is understood in relation to events. Hawking writes: "Since events before the Big Bang have no observational consequences, one may as well cut them out of the theory, and say that time began at the Big Bang. Events before the Big Bang, are simply not defined, because there's no way one could measure what happened at them... [T]he universe, and time itself, had a beginning in the Big Bang, about 15 billion years ago. The beginning of real time, would have been a singularity, at which the laws of physics would have broken down." (See here)

























