Sigmund Freud,
Three Contributions to the Theory of Sex
“ But both in this temporal succession as well as in the duration of the same, variations seem to occur, which must exercise a definite influence on the experience. It cannot be a matter of indifference whether a certain stream appears earlier or later than its counterstream, for the effect of a repression cannot be made retrogressive; a temporal deviation in the composition of the components regularly produces a change in the result. ”
