What is the meaning of inwardness?

noun

• The choicest or most essential or most vital part of some idea or experience.
  • usage: "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"
  • synonyms: kernel, substance, core, center, centre, essence, gist, heart, heart and soul, marrow, meat, nub, pith, sum, nitty-gritty
• Preoccupation especially with one's attitudes and ethical or ideological values.
  • usage: "the sensitiveness of James's characters, their seeming inwardness"; "inwardness is what an Englishman quite simply has, painlessly, as a birthright"
• The quality or state of being inward or internal.
  • usage: "the inwardness of the body's organs"
• Preoccupation with what concerns human inner nature (especially ethical or ideological values. ) "Socrates' inwardness, integrity, and inquisitiveness- H. R. Finch
  • synonyms: internality