Full Idea
When we enquire whether a truth definition defines the class of true sentences in a particular language, we are thinking of the truth definition as stipulating a possible language.
Gist of Idea
To define a class of true sentences is to stipulate a possible language
Source
Donald Davidson (Truth and Predication [2005], 7)
Book Reference
Davidson,Donald: 'Truth and Predication' [Belknap Harvard 2005], p.153
A Reaction
Thus I might say "Nij wonk yang" is true if and only if snow is white, and make my first step towards a new language. An interesting way of looking at Tarski's project.