Full Idea
Truth is a value of thought. The word 'truth' cannot have any other meaning.
Gist of Idea
Truth is a value of thought
Source
Simone Weil (Reflections on Value [1941], p.32)
Book Reference
Weil,Simone: 'Late Philosophical Writings' [Notre Dame 2015], p.32
A Reaction
This makes a nice change from truth being a mere predicate. I would call truth the criterion of success in thought, and that counts as a value, so she is right.