Bill Nye
Besides initiative you need to have finishiative.
The Yoruba proverb says it older and better:
Yoruba proverb
Ìbẹ̀rẹ̀ kọ́ l’onísẹ́, à fi ẹni tó bá fi orí tì í d’ópin. To start anything is not as crucial as seeing it through to completion.
Don’t start what you won’t finish; finish whatever you start.