Full Idea
The conception of Frege is that self-evidence is an intrinsic property of the basic truths, rules, and thoughts expressed by definitions.
Gist of Idea
Fregean self-evidence is an intrinsic property of basic truths, rules and definitions
Source
William D. Hart (The Evolution of Logic [2010], p.350)
Book Reference
Burge,Tyler: 'Truth, Thought, Reason (on Frege)' [OUP 2001], p.350
A Reaction
The problem is always that what appears to be self-evident may turn out to be wrong. Presumably the effort of arriving at a definition ought to clarify and support the self-evident ingredient.