He thought deeply and said, 'I think, therefore I am.'

I am interested in Japanese language education.

He strongly believes in the philosophical thought, 'I think, therefore I am.'

If I do say so myself, I think this dish is the best one I've ever made.

He often forgets himself because he is too absorbed in his work.

He accepted the challenge with an audacious attitude.

I was surprised by his audacious attitude.

He passionately discussed the problem of other minds in his philosophy class.

We must cooperate to solve this problem.

He finally came to after losing consciousness.