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Important questions in the philosophy of time include: Is time absolute or merely relational? Is time without change conceptually impossible or is there more to the idea? Does time "pass" or are the ideas of past, present and future entirely subjective, descriptions only of our deception by the senses?
Zeno's paradoxes fundamentally challenged the ancient conception of time, and thereby helped motivate the development of calculus. McTaggart believed, rather eccentrically, that time and change are illusions. Parmenides (of whom Zeno was a follower) held a similar belief based on a rather interesting argument .A point of contention between Newton and Leibniz concerned the question of absolute time: the former believed time was, like space, a container for events, while the latter believed time was, like space, a conceptual apparatus describing the interrelations between events.
An issue of philosophical debate is whether time is an ontological entity itself, or simply a conceptual framework we need to think (and talk) about the world. Another way to frame this is to ask, "Can time itself be measured, or is time the measurement system?" The same debate applies also to space, and was given an important formulation in both areas by Immanuel Kant.
Einstein's linking of time and space into spacetime also had philosophical consequences, making the idea of block time more credible, and thus affecting ideas of free will and causality.Existentially, time has been considered fundamental to the Question of Being , in particular by the philosopher Martin Heidegger.
"What is time? I know what it is, but when you ask me I don't." - Augustine of Hippo
"Time is an illusion, lunchtime doubly so." - Douglas Adams, The Hitchhiker's Guide to the Galaxy
"Time is money." - Benjamin Franklin
"Time exists so that everything doesn't happen at once. Space exists so that everything doesn't happen to me." - anonymous
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