It is the event that is the immediate entity of perception; Nature is the sum-total of events, and every instrument of thought that our minds employ … - Herbert Dingle

A ray of light, passing close to a heavy body, should, on Einstein's assumption, suffer a slight chance of direction, as if it were pulled towards the body. According to Newton's principles, there seems to be no reason why the light should be bent at all. It is possible, however, that light possesses the equivalent of weight in a material body, and, if so, the gravitational force should cause a bending similar to that predicted by the theory of relativity, but of only half the amount.

Between the Charybdis of inaccuracy and the Scylla of abstruseness, the course is narrow and the sea is rough.

Matter, space, and time ... according to the relativist, are types of relations between events.