The past and the future are not a collection of instants shared by all space but a collection of events that correspond to a possible relation of causal order with the present event.

The past and the future are not a collection of instants shared by all space but a collection of events that correspond to a possible relation of causal order with the present event.
Felix Alba Juez

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... One can know very much but comprehend very little and besides ... different objectives require different levels of knowledge though always with the maximum possible comprehension suited to the purpose.
- Felix Alba Juez
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The notion of Local Inertial Frame is crucial to understanding Nature and in particular General Relativity. Notwithstanding very few popular science books not even textbooks emphasize enough its fundamental character.
- Felix Alba Juez

The past and the future are not a collection of instants shared by all space but a collection of events that correspond to a possible relation of causal order with the present event. Felix Alba Juez

The past and the future are not a collection of instants shared by all space but a collection of events that correspond to a possible relation of causal order with the present event.
Felix Alba Juez