Matthew Henry
Here is,
He trusts to his own heart, to his own wisdom and counsels, his own strength and sufficiency, his own merit and righteousness, and the good opinion he has of himself; he that does so
is a fool, for he trusts to that, not only which
is deceitful above all things(Jer 17:9), but which has often deceived him. This implies that it is the character of a wise man (as before, Prov 28:25) to
put his trust in the Lord, and in his power and promise, and to follow his guidance, Prov 3:5, Prov 3:6.
walks wisely, that trusts not to his own heart, but is humble and self-diffident, and goes on in the strength of the Lord God,
he shall be delivered; when the fool,
that trusts in his own heart, shall be destroyed.