Adam Clarke's Commentary on the Bible - Mark 13:30
This generation - Ἡ γενεα αὑτη , This very race of men. It is certain that this word has two meanings in the Scriptures; that given in the text, and that above. Generation signifies a period of a certain number of years, sometimes more, sometimes less. In Deuteronomy 1:35 ; Deuteronomy 2:14 , Moses uses the word to point out a term of thirty-eight years, which was precisely the number in the present case; for Jerusalem was destroyed about thirty-eight years after our Lord delivered... read more
Adam Clarke's Commentary on the Bible - Mark 13:20
Had shortened those days - Because of his chosen, added by D, Armenian, and five of the Itala. See Matthew 24:22 . read more