You simple, learn shrewdness; you fools, gain an understanding heart.
In context
3beside the gates, at the mouth of the town, at the entrance of the doors she cries aloud: 4“To you, people, I call, and my voice is to all humanity. 5You simple, learn shrewdness; you fools, gain an understanding heart. 6Listen, for I speak of noble things, and the opening of my lips is what is right. 7For my mouth utters truth, and wickedness is an abomination to my lips.
