  In this paper we explore the relationship between the existence of eternal
inflation and the initial conditions leading to inflation. We demonstrate that
past and future completion of inflation is related, in that past-incomplete
inflation can not be future eternal. Bubble universes nucleating close to the
initial conditions hypersurface have the largest Lorentz boosts and experience
the highest anisotropy. Consequently, their probability to collide upon
formation is one. Thus instead of continuing eternally inflation ends soon
after it starts. The difficulty in actualizing eternal inflation originates
from the breaking of two underlying symmetries: Lorentz invariance and the
general covariance of the theory which lead to an inconsistency of Einstein
equations. Eternal inflation may not be eternal.
