Epistemology is the philosophical study of the origin, nature, and scope of knowledge.

His way of thinking is very philosophical.

What is the origin of this word?

His nature is very kind, and he is liked by everyone.

Let's define the range of this project.

His talent is widely recognized.

He recognized me immediately.

He is majoring in philosophy.

I'm always amazed by his extensive knowledge.

He is researching about a new energy source.