Sanders thinks as he packs his passport. Later, this will have ramifications as Sanders will attempt to lead everyone and everything out of the living world into the crystal world, where time has eneded and nothing more can happen, and thought will cease. So, paradoxically perhaps, the psychological goal is a physical state. This goal is reinforced throughout the novel - ambigous motives are repeated though the novel. While this may just be due to the narrative viewpoint being that of Sanders, other elements also stress it.
Sanders seems to be confirmed as a trustworthy source of opinion.
On the other hand, Ballard has provided an alternative reading of this repitition of key words. In this forest we see the final celebration of the Eucharist of Christ's body. Sanders becomes the subject of the novel, not its moral purpose. The discrepancy between the role of the abstract psychological goals and the material world causes events but does not defend them. It is the interplay and clash of these incongruities that gives the novel its depth.