  We discuss non-perturbative dynamics of massive gravity in de Sitter space
via gravitational Higgs mechanism. We argue that enhanced local symmetry and
null (ghost) state at (below) the perturbative Higuchi bound are mere artifacts
of not only linearization but also assuming the Fierz-Pauli mass term. We point
out that, besides de Sitter, there are vacuum solutions where the space
asymptotically is de Sitter both in the past and in the future, the space first
contracts, this contraction slows down, and then reverses into expansion, so
there is an epoch where the space appears to be (nearly) flat, even though the
vacuum energy density is non-vanishing. We confirm this by constructing a
closed-form exact solution to full non-perturbative equations of motion for a
"special" massive de Sitter case. We give a formula for the "critical" mass
above which such solutions apparently do not exist. For the Fierz-Pauli mass
term this "critical" mass coincides with the perturbative Higuchi bound, and
the former serves as the non-perturbative reinterpretation of the latter. We
argue that, notwithstanding the perturbative ghost, non-perturbatively there is
no "instability". Instead, there are additional vacuum solutions that may have
interesting cosmological implications, which we briefly speculate on.
