Where there is a will, there is a way. Who said that? Which book is it from?

When the general built this grand plan in Nanyang, he often thought that where there is a will, there is a way (Biography of Geng Yan in the Later Han Dynasty).

Geng Yi recovered its lost territory and made great contributions. Emperor Guangwu Liu Xiu praised him and said, "... where there is a will, there is a way." "It means that ambitious people can succeed in the end.

This sentence shows that no matter how difficult it is, a person can succeed as long as he has ambition and perseverance.