Is a good act rooted in a good will? Matteo Ricci and a Chinese scholar had a debate on that topic. When humans always have a good will, they can do good, according to Ricci. As humans were created by the Lord of Heaven, the supreme good, their nature is good. But man’s first ancestor, Adam, committed a sin, an original sin, so humans are born with original sin. According to that, when humans have a good will, they will be able to do good. By contrast, if humans have an evil will, they will be able to do evil. Ricci interpreted so even yi(意) in The Great Learning (大學), one of the Confucian classics. This interpretation was based on Aquinas but that of Ricci is not implied in the Confucian classic. By contrast, the Chinese scholar argued that a good act is regardless of a good will. According to the scholar, a good act emerges from a good mind, not a good will.