these involuntary responses are not here attributed to impulses. He calls the ‘blows’: primus ille ictus animi. He stresses that such reactions are passive (patitur magis animus quam facit), compares them again to bodily reactions, and insists repeatedly that they are not the result of assent.
Inwood demonstrates that Seneca’s account of pre-passions as the ‘first blow of the mind’ — involuntary, passive, and prior to assent — exposes a structural instability in Stoic psychological monism.
, Ethics and Human Action in Early Stoicism, 1985thesis