Full Idea
Davidson's response to the problem of how you would state truth conditions for "I am sick now" ...is to relativize its truth to a particular speaker and a time.
Gist of Idea
You can state truth-conditions for "I am sick now" by relativising it to a speaker at a time
Source
report of Donald Davidson (Truth and Meaning [1967]) by William Lycan - Philosophy of Language Ch.9
Book Reference
Lycan,William G.: 'Philosophy of Language' [Routledge 2000], p.142
A Reaction
Lycan is not happy with this, but it seems a reasonable way to treat the truth of any statement containing indexicals. Never mind the 'truth conditions theory of meaning' - just ask whether "I am sick now" is true.