Albert Barnes Commentary Proverbs 28:18

"Whoso walketh uprightly shall be delivered; But he that is perverse in [his] ways shall fall at once." — Proverbs 28:18 (ASV)

In his ways - Rather “in his double ways” . The evil of vacillation rather than that of craft, the lack of the one guiding principle of right, is contrasted with the straightforwardness of the man who “walketh uprightly.”

Shall fall at once - Better, he shall fall in one of them (his ways). The attempt to combine incompatibilities is sure to fail. Men cannot serve God and Mammon.