If one ponders on objects of the sense, there springs attraction; from attraction grows desire, desire flames to fierce passion, passion breeds recklessness; then the memory lets go the helm, and reason wrecks faith; and faith once wrecked, a man is lost!
Krishna has described the person of steady wisdom (sthitaprajna). Now he shows the reverse — how an undisciplined mind cascades from a single sensory thought into total ruin: thought → attachment → desire → anger → delusion → memory loss → reason destroyed → the person is lost.
The Gita’s most precise psychological analysis: a step-by-step chain from contemplation to desire to anger to delusion to destruction. A warning about how attachment unravels the self.