无法拒绝的是开始无法抗拒的是结束
[wú fă jù jué de shì kāi shĭ wú fă kàng jù de shì jié shù]
Unable to refuse the beginning, unable to resist the end suggests that some things start unexpectedly and inevitably lead to an end one cannot avoid, highlighting the inevitability of certain situations or relationships.