Changes

Inertia is the very character of the physical consciousness left to itself—it is accustomed to be passive to forces and to be their instrument or give a mechanical response to them.

Dullness, uneasiness, weakness, feeling old and worn out or ill, are the reactions that come when the inertia of the physical Nature resisting the Light. <ref>http://incarnateword.in/cwsa/31/difficulties-of-the-physical-nature#p14,p16,p18</ref>