Proverbs 10:9

We are here told, and we may depend upon it, 1. That men's integrity will be their security: He that walks uprightly towards God and man, that is faithful to both, that designs as he ought and means as he says, walks surely; he is safe under a divine protection and easy in a holy security. He goes on his way with a humble boldness, being well armed against the temptations of Satan, the troubles of the world, and the reproaches of men. he knows what ground he stands on, what guide he follows, what guard he is surrounded with, and what glory he is going to, and therefore proceeds with assurance and great peace, Isa 32:17; Isa 33:15, Isa 33:16. Some understand it as part of the character of an upright man, that he walks surely, in opposition to walking at all adventures. He will not dare to do that which he is not fully satisfied in his own conscience concerning the lawfulness of, but will see his way clear in every thing. 2. That men's dishonesty will be their shame: He that perverts his way, that turns aside into crooked paths, that dissembles with God and man, looks one way and rows another, though he may for a time disguise himself, and pass current, shall be known to be what he is. It is a thousand to one but some time or other he betrays himself; at least, God will discover him in the great day.

— Matthew Henry's Concise Commentary (public domain)

perverteth his ways--acts deceitfully. known--discovered and punished.

— Jamieson-Fausset-Brown Commentary (public domain)