  Lattice results on sigma terms and global analysis of parton momentum
fractions are used to give the quark and glue fractions of the proton mass and
rest energy. The mass decomposition in terms of the trace of the
energy-momentum tensor is renormalization group invariant. The decomposition of
the rest energy from the Hamiltonian and the gravitational form factors are
scheme and scale dependent. The separation of the energy-momentum tensor into
the traceless part which is composed of the quark and glue parton momentum
fractions and the trace part has the minimum scheme dependence.
  We identify the glue part of the trace anomaly $\langle H_{\beta}\rangle $ as
the vacuum energy from the glue condensate in the vacuum. From the metric term
of the gravitational form factors, which is the stress part of the
stress-energy-momentum tensor, we find that the trace part of the rest energy,
dominated by $\langle H_{\beta}\rangle$, gives a {\it constant} restoring
pressure which balances that from the traceless part of the Hamiltonian to
confine the hadron, much like the cosmological constant Einstein introduced for
a static universe. From a lattice calculation of $\langle H_{\beta}\rangle$ in
the charmonium, we deduce the associated string tension which turns out to be
in good agreement with that from a Cornell potential which fits the charmonium
spectrum.
