  I present a new way to solve the Wheeler--de Witt equation using the
invariance of the classical lagrangian under reparametrization. This property
allows one to introduce an arbitrary function for each degree of freedom of the
wave function $\Psi$: this arbitrariness can be used to fix the asymptotic
behaviour of $\Psi$ so as to obtain a wave function representing a closed
universe or a wormhole. These considerations are applied in detail to the
Kantowsky--Sachs spacetime.
