The rule of the Scriptures is only to know two generations, one of good the other of bad. Of the generation of the good it is said, “The generation of the righteous shall be blessed.” [Ps 112:2] And of the bad it is said in the present passage, “Generation of vipers.” These then, because they did against the Apostles like things as Cain and Joas, are described as of one generation.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).