From Roger Zelazny's "Divine Madness"
"How does a man undo that which has been done? He doesn't. There is
no way under the sun. He may suffer, remember, repent, curse, or forget. Nothing else. The past, in this sense, is inevitable." pg. 193

From Alfred Jarry's "How to Construct a Time Machine"
"2. Theory of the Machine
"A Machine to isolate us from Duration, or from the action of Duration (from growing older or younger, the physical drag which a succession of motions exerts on an inert body) will have to make us 'transparent' to these physical phenomena, allow them to pass through us without modifying or displacing us. This isolation will be sufficient (in fact it would be impossible to design it any more efficiently) if Time, in overtaking us, gives us a minimal impulse just great enough to compensate for the deceleration of our habitual duration conserved by inertia. This slowing down would be due to an action comparable to the viscosity of a liquid or the friction of a machine.
"To be stationary in Time means, therefore, to pass with impunity through all bodies, movements, or forces whose locus will be the point of space chosen by the Explorer for the point of departure of his MACHINE OF ABSOLUTE REST OR TIME MACHINE. Or one can think of oneself as being traversed by these events, as a projectile passes through an empty window frame without damaging it, or as ice re-forms after being cut by a wire, or as an organism shows no lesion after being punctured by a sterile needle." pp. 200-201

From David I. Masson's "Traveller's Rest"
"No one had ever seen the Enemy. No one knew how or when the War had begun. Information and communication were paralysingly difficult up here. No one knew what really happened to Time as one came close to the Frontier, or beyond it. Could it be that the conceleration there became infinite and that there was nothing beyond the Frontier? Could all the supposed missiles of the Enemy be their own, somehow returning? Perhaps the war had started with a peasant explorer light-heartedly flinging a stone northwards, which returned and struck him? Perhaps there was, then, no Enemy?" pp. 142-143