John Trapp on Jeremiah 17:5

Ver. 5. Curſed be the man that truſteth in man] Diſſerit hic de ſummo bono, & de ſummo malo, ſaith one: here the Prophet diſcourſeth of the chief good and of the chief evil. This later he pronounceth to be to depart from God, and to depend upon the creature for help: for ſuch a man, ſeem he never ſo manly a man (haggheber) is accurſed of God, whom he robbeth of his chief jewel, that which giveth him the ſoveraignty, and ſetteth, as it were, the crown upon his head. See Judg. 9.15. Pſal. 78.22. and 52.7.

And maketh fleſh his arm] i. e. His ſtrength: for in brachio eſt robur. Now three wayes, ſaith a Reverend man, we make fleſh our arm, Mr. Caſe. 1. By ſitting down in a faithleſſe ſullen diſcontent and deſpair when we can ſee no ſecond cauſes. 2. By riſing up in a corky frothy confidence, when we ſee ſufficient humane help. 3. When we aſcribe the glory of our good to it, ſacrificing to our own net, Habak. 1. This is to pull the curſe upon our heads with twiſted wrath and indignation.

Whoſe heart departeth from God] He truſteth not God at all, who truſteth him not over all.