In psalm 8 it refers to ‘man’ and ‘son of man’. Why is there a distinction between the two?
… what is man that you are mindful of him, and the son of man that you care for him?
Also, are there any parallels with Hebrews 2:6 or is the writer there trying to use the phrase in a new or different way?
…(6) But there is a place where someone has testified: "What is mankind that you are mindful of them, a son of man that you care for him?