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Full Idea
Self-evident propositions are those which appear evident to every man of sound understanding who apprehends the meaning of them distinctly, and attends to them without prejudice.
Gist of Idea
Truths are self-evident to sensible persons who understand them clearly without prejudice
Source
Thomas Reid (Essays on Intellectual Powers 2: Senses [1785], 10)
Book Ref
Reid,Thomas: 'Inquiry and Essays', ed/tr. Beanblossom /K.Lehrer [Hackett 1983], p.170
A Reaction
I suspect that there are some truths which are self-evident to dogs. There are also truths which are self-evident to experts, but not to ordinary persons of good understanding. Self-evidence is somewhat contextual. Self-evidence can be empirical.