Full Idea
Arguments from analogy are to be distrusted: at best they can serve as heuristics.
Clarification
A 'heuristic' is a guide
Gist of Idea
Don't trust analogies; they are no more than a guideline
Source
Volker Halbach (Axiomatic Theories of Truth [2011], 4)
Book Reference
Halbach,Volker: 'Axiomatic Theories of Truth' [CUP 2011], p.25