He is pursuing self-enlightenment through Zen riddle dialogue.

He was hospitalized because of heart failure.

His success was an inevitable result.

He is an expert in natural language processing.

I am studying natural language processing at university.

He is facing the problem of erectile dysfunction.

This sentence is written in the present tense.

He looked around in all directions, but there was no one.

Zen is a festival ceremony performed by the Chinese emperor.

Through the practice of Zen, I gained peace of mind.