  We show that the Jantzen filtration of a Verma module (possibly singular)
coincides with its radical filtration. It implies that the Jantzen Conjecture
on Verma modules holds for all infinitesimal characters, while the regular case
was settled by Beilinson and Bernstein by geometric methods and reproved by
Williamson by an algebraic approach. The coincidence between Jantzen filtration
and radical filtration is also generalized to the case of parabolic Verma
modules by Shan's results.
