On the other hand, any two particulars of which I am aware are either simultaneous or successive, and their simultaneity or successiveness is sometimes itself a datum to me.
"Mysticism and Logic and Other Essays"
Bertrand Russell
It springs from the same postulate, with this sole difference, that in the movement of our finite intellects along successive things, whose successiveness is reduced to a mere appearance, it holds in front of us the light with which it claims to guide us, instead of putting it behind.
"Our Knowledge of the External World as a Field for Scientific Method in Philosophy"
Bertrand Russell