Cicero in Long and Sedley, pg. 387
"But if the cause of impulse is not located in us, neither is impulse itself in our power. If that is so, not even the results of impulse are in our power. Therefore neither acts of assent, nor actions are in our power."
"If actions are not in our power, the result is that neither commendations nor reproofs nor honours nor punishments are just."
David Lewis, "Causation," Journal of Philosophy, 70, 1973
"The prevailing laws of nature are such that there do not exist any two possible worlds which are exactly alike up to some time, which differ thereafter, and in which those laws are never violated."