This their way is their folly: yet their posterity approve their sayings. Selah.
This their way (is) their folly - "their way," whereby they virtually think themselves immortal, and therefore desire their houses to continue forever, wise as they regard it, "is their folly," as the event shows. Or "way" may be taken as their portion, their lot, as in Psalms 1:6; Psalms 37:5; then translate, 'This (is) their way, (their fate, so there is) folly to them' - i:e., they are by the event convicted of folly.
Yet their posterity approve their sayings - literally, 'delight in their mouth;' i:e., in their maxims of living, especially in their boastful speeches, promising themselves immortality, and "calling their lands after their own names." They have "a mouth speaking great things" (Daniel 7:8; cf. Psalms 73:8).