correct the primary process. The primary process strives for a discharge
of the excitement in order to establish a _perception_ identity with the
sum of excitement thus gathered; the secondary process has abandoned
this intention and undertaken instead the task of bringing about a
_thought identity_. All thinking is only a circuitous path from the
memory of gratification taken as an end-presentation to the identical
occupation of the same memory, which is again to be attained on the
track of the motor experiences. The state of thinking must take an
interest in the connecting paths between the presentations without
allowing itself to be misled by their intensities. But it is obvious
that condensations and intermediate or compromise formations occurring
in the presentations impede the attainment of this end-identity; by
substituting one idea for the other they deviate from the path which
otherwise would have been continued from the original idea. Such
processes are therefore carefully avoided in the secondary thinking. Nor
is it difficult to understand that the principle of pain also impedes
the progress of the mental stream in its pursuit of the thought
identity, though, indeed, it offers to the mental stream the most
important points of departure. Hence the tendency of the thinking
process must be to free itself more and more from exclusive adjustment
by the principle of pain, and through the working of the mind to
restrict the affective development to that minimum which is necessary as
a signal. This refinement of the activity must have been attained
through a recent over-occupation of energy brought about by
consciousness. But we are aware that this refinement is seldom
completely successful even in the most normal psychic life and that our
thoughts ever remain accessible to falsification through the
interference of the principle of pain.

This, however, is not the breach in the functional efficiency of our