2:11 he who sanctifies. See “The Atonement” at Rom. 3:25.

all have one origin. Or, “have the same origin,” that is, God. Another interpretation is, “are of one nature,” that is, human nature.

not ashamed. In view of the Son’s glory portrayed in ch. 1, we might expect Him to recoil from identification with fallible human beings, but He willingly calls us brothers and sisters. Such a family relationship is essential to His compassionate, priestly ministry (v. 17; 5:1; 7:5).