Albert Barnes Commentary Proverbs 5:6

"So that she findeth not the level path of life: Her ways are unstable, [and] she knoweth [it] not." — Proverbs 5:6 (ASV)

Or (according to the Septuagint and Vulgate), so that she will not ponder the way of life (or, “She ponders not” the way of life), her paths move to and fro (unsteady as an earthquake); she does not know. The words describe with a terrible vividness the state of heart and soul which prostitution brings upon its victims: the reckless blindness that will not think, tottering on the abyss, yet loud in its defiant mirth, ignoring the dreadful future.