They argued from a confrontational standpoint.

He confronted himself to face the difficulties.

Einstein's theory of relativity forms the basis of physics.

His success is relative to his efforts.

He was taken to the hospital because of dyspnea.

She uploaded a selfie to Instagram.

She took a selfie and uploaded the photo to social media.

He likes talking about himself and often talks about his experiences and thoughts.

He set out on a journey of soul-searching.

Since that's his own concern, we better not interfere.