ydinmehu (englanniksi)

pith (s: figuratively)
core (s: figuratively)
essence (s: figuratively)
gist (s: figuratively)
heart (s: figuratively)
heart and soul (s: figuratively)
marrow (s: figuratively)
quintessence (s: figuratively)
soul (s: figuratively)
spirit (s: figuratively)
substance (s: figuratively / that which is essential in or which is the core of a presentation, ideology, philosophy etc.)