  A description of how the principle of stationary action reproduces itself in
terms of the intrinsic geometry of variational equations is proposed. A notion
of stationary points of an internal Lagrangian is introduced. A connection
between symmetries, conservation laws and internal Lagrangians is established.
Noether's theorem is formulated in terms of internal Lagrangians. A relation
between non-degenerate Lagrangians and the corresponding internal Lagrangians
is investigated. Several examples are discussed.
