  The choice of priors may become an insoluble problem if priors and Bayes'
rule are not seen and accepted in the framework of subjectivism. Therefore, the
meaning and the role of subjectivity in science is considered and defended from
the pragmatic point of view of an ``experienced scientist''. The case for the
use of subjective priors is then supported and some recommendations for routine
and frontier measurement applications are given. The issue of reference priors
is also considered from the practical point of view and in the general context
of ``Bayesian dogmatism''.
