Full Idea
Every mental phenomenon contains something as object within itself.
Gist of Idea
All mental phenomena contain an object
Source
Franz Brentano (Psychology from an empirical standpoint [1874], p. 88), quoted by Jaegwon Kim - Philosophy of Mind p.21
Book Reference
Kim,Jaegwon: 'Philosophy of Mind' [Westview 1998], p.21
A Reaction
This gives rise to the slogan that 'intentionality is the mark of the mental', which notoriously seems to miss out the phenomenal aspect of mental life. We note now, though, that even emotions have objects.