Full Idea
If we turn our minds towards the good, it is impossible that little by little the whole soul will not be attracted thereto in spite of itself.
Gist of Idea
If we focus on the good, our whole soul is drawn towards it
Source
Simone Weil (Gravity and Grace [1942], 'Attention')
Book Reference
Weil,Simone: 'Gravity and Grace', ed/tr. Crawford/De Ruhr [Routledge 1952], p.117
A Reaction
This is a better expression of Plato's basic metaethics than anything in Plato. What puzzles everyone is what you are supposed to be thinking of when you focus your mind this way.