E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Calvin (Admonitio de Reliquiis) gives a long list of places claiming to possess one or more of the thorns which composed the Saviours crown. To his list may be added Glastonbury Abbey, where was also the spear of Longius or Longinus, and some of the Virgins milk.
The thorns of Dauphiné will never prick unless they prick the first day. This proverb is applied to natural talent. If talent does not show itself early, it will never do sothe truth of which application is very doubtful indeed.