“It is of interest to inquire what happens when the aviator's speed… approximates to the velocity of light.”
Space, Time and Gravitation (1920)
Context: It is of interest to inquire what happens when the aviator's speed... approximates to the velocity of light. Lengths in the direction of flight become smaller and smaller, until for the speed of light they shrink to zero. The aviator and the objects accompanying him shrink to two dimensions. We are saved the difficulty of imagining how the processes of life can go on in two dimensions, because nothing goes on. Time is arrested altogether. This is the description according to the terrestrial observer. The aviator himself detects nothing unusual; he does not perceive that he has stopped moving. He is merely waiting for the next instant to come before making the next movement; and the mere fact that time is arrested means that he does not perceive that the next instant is a long time coming.<!--p.26
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Arthur Stanley Eddington 105
British astrophysicist 1882–1944Related quotes

“At the speed of light there is no sequence; everything happens at the same instant.”
1970s, Tomorrow Show with Tom Snyder (1976)

Interview between Californian Governor Jerry Brown and Marshall McLuhan, 1977
1970s

A Dynamical Theory of the Electromagnetic Field (1864), §20.
Context: The general equations are next applied to the case of a magnetic disturbance propagated through a non-conductive field, and it is shown that the only disturbances which can be so propagated are those which are transverse to the direction of propagation, and that the velocity of propagation is the velocity v, found from experiments such as those of Weber, which expresses the number of electrostatic units of electricity which are contained in one electromagnetic unit. This velocity is so nearly that of light, that it seems we have strong reason to conclude that light itself (including radiant heat, and other radiations if any) is an electromagnetic disturbance in the form of waves propagated through the electromagnetic field according to electromagnetic laws.

Aviation, Geography, and Race (1939)
Context: The forces of Hannibal, Drake and Napoleon moved at best with the horses' gallop or the speed of wind on sail. Now, aviation brings a new concept of time and distance to the affairs of men. It demands adaptability to change, places a premium on quickness of thought and speed of action.
Military strength has become more dynamic and less tangible. A new alignment of power has taken place, and there is no adequate peacetime measure for its effect on the influence of nations. There seems no way to agree on the rights it brings to some and takes from others.

Referring to network latency limitations, Quoted in John Carmack Biography http://www.biographybase.com/biography/Carmack_John.html.

“Change happens at the speed of trust. (cf. The SPEED of Trust, 2008)”
First Things First (1994), Disputed