the term that is crucial here is the vaulting nature of ambition to go to the verge… ambition seeks by its very nature to go too far. Self-limitation, by means of willpower and developed self-control as a braking restraint, misses the inner sense of ambition which must go beyond better judgment
Hillman argues that ambition is constitutionally excessive—it is not a controllable trait but an autonomous drive toward transgression of limits, rendering self-restraint structurally inadequate as a response.
, Kinds of Power: A Guide to Its Intelligent Uses, 1995thesis