19 the way of an eagle in the sky, the way of a serpent on a rock, the way of a ship on the high seas, and the way of a man with a maiden.

Matthew Henry's Commentary on Proverbs 30:19

Commentary on Proverbs 30:18-20

(Read Proverbs 30:18-20)

Four things cannot be fully known. The kingdom of nature is full of marvels. The fourth is a mystery of iniquity; the cursed arts by which a vile seducer gains the affections of a female; and the arts which a vile woman uses to conceal her wickedness.