Full Idea
The wise man is astonished at none of the things which appear to be wonders, such as the caves of Charon or tidal ebbs or hot springs or fiery exhalations from the earth.
Gist of Idea
Wise men are never astonished at things which other people take to be wonders
Source
report of Stoic school (fragments/reports [c.200 BCE]) by Diogenes Laertius - Lives of Eminent Philosophers 07.123
Book Reference
'The Stoics Reader', ed/tr. Inwood,B/Gerson,L.P. [Hackett 2008], p.122
A Reaction
This seems to me to be correct. Wise people will have thought more extensively about what is possible, and when something they had never imagined occurs, they have the humility to recognise their own limitations.