What can a person be said to possess? Yes, there are material possessions, personal relationships, language skills, knowledge of history, professionals achievements. But these are particulars - what are the most fundamental possessions of man?
More precisely, what are the intrinsic ends of human action?
Proposition: pleasure, wisdom, and power are the three intrinsic ends of man.
Pleasure - momentary by nature, man's experience of himself, a physiological experience.
Wisdom - everlasting by nature, man's experience of his Creator, a spiritual experience.
Power - everything not momentary and not everlasting, man's experience of others, a social experience.
With respect to Plato's theory of the soul as explained in Book IV of The Republic:
Pleasure is epithumia.
Wisdom is nous.
Power is thumos.
And, of course, Catholicism:
Pleasure is body.
Wisdom is spirit.
Power is soul.
In other words, it ends where it begins. Yes, there really are only three red pills.