  We examine Dirac's early algebraic approach which introduces the {\em
standard} ket and show that it emerges more clearly from a unitary
transformation of the operators based on the action. This establishes a new
picture that is unitarily equivalent to both the Schr\"{o}dinger and Heisenberg
pictures. We will call this the Dirac-Bohm picture for the reasons we discuss
in the paper. This picture forms the basis of the Feynman path theory and
allows us to show that the so-called `Bohm trajectories' are averages of an
ensemble of Feynman paths.
