The steps of his strength shall be straitened, and his own counsel shall cast him down.
The rest of Bildad's discourse is entirely taken up in an elegant description of the miserable condition of a wicked man, in which there is a great deal of certain truth, and which will be of excellent use if duly considered - that a sinful condition is a sad condition, and that iniquity will be men's ruin if they do not repent of it.
Commenting on Job 18:5-10
For he is cast into a net by his own feet,.... He goes into it of himself, incautious and imprudent; the counsels, schemes, and methods he takes to hurt others, issue in his own ruin; the pit he digs for them, he falls and sinks into himself; and the net which he has spread and hid for others, in it is his own foot taken...
steps of his strength--Hebrew, for "His strong steps." A firm step marks health. To be straitened in steps is to be no longer able to move about at will (Pro 4:12). his own counsel--Plans shall be the means of his fall (Job 5:13).