Hebrews 5:11

Of whom. Or, “concerning which.” The Greek may be understood either way. “Of whom” would apply to Melchisedec, concerning whom the author says many things (see eh. 7). “Concerning which” would apply to the high priesthood of Christ after the manner of Melchisedec.

Hard to be uttered. Or, “hard to explain.” The author realized the difficulty of his subject, and that spiritual perception was needed on the part of the church. It is evident that he was well acquainted with his readers, or he would not dare speak of them as he does.

Dull of hearing. Or, “slow [or “sluggish”] of hearing.” This condition makes it difficult for the author to present his subject. His difficulty is twofold: a hard subject and dull hearers. The limitation of the student is the limitation of the teacher.