The Soul

What makes cakes a good cake? 
Is it the flour? The eggs? 
The ingredients, the oven?

What makes books a good read? 
Is it the plot, the conflicts? 
The characters or the characteristics?

What makes music a good sound? 
Is it the lyric, the melody?
The instruments?

What makes a human a good person? 
Is it the face, the car, the house? 
Their properties or their positions and possessions?

No.

There's only one answer.

THE SOUL.