He is trying to understand the concept of Trinity in Christianity.

He feels it takes time to acquire new skills, but Rome wasn't built in a day.

He is the type of person who understands ten from hearing one.

In Christianity, God is considered as the Trinity of the Father, the Son, and the Holy Spirit.

He decided to start a new business and reminded himself that even a journey of a thousand miles begins with a single step.

I like memorizing the Hyakunin Isshu.

It's difficult to memorize the Hyakunin Isshu.

Nitrous oxide is one cause of air pollution.

He likes to read The Arabian Nights.

The thirty-first day is my birthday.