Hō a‘e ka ‘ike he‘enalu i ka hokua o ka ‘ale.
Show (your) knowledge of surfing on the back of the wave.
Talking about one's knowlege and skill is not enough; let it be proven.
From ‘Ōlelo No‘eau, Hawaiian Proverbs and Poetical Sayings, by Mary Kawena Pukui, Bishop Museum Press
Found on the inside back page of the Summer 2013 issue of Island Scene Magazine.