He refused to explain why he was attacking--in his eyes the island was always Chinese, the Dutch had used it for a while, and now he needed it and it was time for the Dutch to give way.
這段晉見時的對話，在「被遺誤的台灣」一書中，有相當精采的描述。鄭成功首先拒絕提供攻城理由，原因很簡單：此一島嶼向屬中國，荷蘭人曾經被准許在此居住，那是由於當時中國人自己沒有需要。但現在國姓爺自己要用了，荷蘭外夷，自該退讓。