It will be a heaven-sent opportunity to prove himself.

那将是他证明自己的一个天赐良机。

《柯林斯英汉双解大词典》

For Mr McCain, the war is a heaven-sent opportunity to raise his profile and thus convince Republicans to give him money, despite his annoying tendency to take positions contrary to the party line on campaign finance and tobacco.

ECONOMIST: Suddenly, a pre-primary electability indicator