Full Idea
Truth is an idealisation of rational acceptability; we speak as if there were such things as epistemically ideal conditions, and we call a statement 'true' if it would be justified under such conditions.
Gist of Idea
Truth is an idealisation of rational acceptability
Source
Hilary Putnam (Reason, Truth and History [1981], Ch.3)
Book Reference
Putnam,Hilary: 'Reason, Truth and History' [CUP 1998], p.55
A Reaction
The second part makes human beings sound stupid (which they are not), but the first part is right, and incredibly important. Peirce is behind Putnam's thought. Truth is the target of belief. It isn't a nonsense just because we can't be infallible.