'The generations of Noah' means a description of the reformation or regeneration of the new Church. 'Noah was a righteous and blameless man among members of his own generation' means that he was such as could be endowed with charity, 'righteous' having regard to the good of charity, and 'blameless' to the truth of charity; while 'members of his own generation' has to do with faith. 'Walking with God' here, as previously when Enoch was the subject, means the doctrine of faith.