inwardness - noun

the choicest or most essential or most vital part of some idea or experience

preoccupation especially with one's attitudes and ethical or ideological values

the quality or state of being inward or internal

preoccupation with what concerns human inner nature (especially ethical or ideological values)

inwardness - thesaurus

center   centre   core   essence   gist   heart   internality   kernel   marrow   meat   nub   pith   substance   sum