16:18-21 See the fatal effects of false security. Satan ruins men by flattering them into a good opinion of their own safety, and so bringing them to mind nothing, and fear nothing; and then he robs them of their strength and honour, and leads them captive at his will. When we sleep our spiritual enemies do not. Samson's eyes were the inlets of his sin, (ver. 1,) and now his punishment began there. Now the Philistines blinded him, he had time to remember how his own lust had before blinded him. The best way to preserve the eyes, is, to turn them away from beholding vanity. Take warning by his fall, carefully to watch against all fleshly lusts; for all our glory is gone, and our defence departed from us, when our separation to God, as spiritual Nazarites, is profaned.

Jud 16:21, 22. The Philistines Took Him and Put Out His Eyes.

21. the Philistines took him, and put out his eyes—To this cruel privation prisoners of rank and consequence have commonly been subjected in the East. The punishment is inflicted in various ways, by scooping out the eyeballs, by piercing the eye, or destroying the sight by holding a red-hot iron before the eyes. His security was made doubly sure by his being bound with fetters of brass (copper), not of leather, like other captives.

he did grind in the prison-house—This grinding with hand-millstones being the employment of menials, he was set to it as the deepest degradation.