Hosea added a conclusion to his prophecies that is a word of wisdom for the discerning reader. One should learn three things from this book. First, the Lord’s “ways” are correct, and therefore, best. Second, righteous people will choose to walk in the Lord’s ways and to keep His covenant commands because that results in blessing. Third, transgressors (rebels) will stumble over His ways and bring destruction on themselves for their disobedience. Their downfall results from their failure to obey His commands, to walk in His ways.
This closing verse applies the teaching of the whole Book of Hosea to all readers. Dr. Constable’s Notes on Hosea
Hosea 14:9 Whoever is wise, let him understand these things; Whoever is discerning, let him know them. For the ways of the LORD are right, And the righteous will walk in them, But transgressors will stumble in them.