From: Xhosa, Southern Africa
Source: Xhosa proverb (Izandla ziya gezana). Caveat: the actual Boston University African Proverbs Project isiXhosa page (bu.edu/africa/.../isixhosa-proverbs/, fetched directly) does not list this proverb among its ten, and several independent pages call the near-identical "Izandla ziyagezana" an isiZulu proverb specifically. Kept as Xhosa pending stronger evidence either way.
The meaning given here is our own reading. Other interpretations exist.