In the day when the keepers of the house shall tremble, and the strong men shall bow themselves, and the grinders cease because they are few, and those that look out of the windows be darkened,
Keepers of the house - namely, the hands and arms which protected the body, as guards do a palace, are now palsied.
Strong men ... bow - as Samson. Like supporting pillars, the feet and knees (Song of Solomon 5:15), the strongest members Strong men ... bow - as Samson. Like supporting pillars, the feet and knees (Song of Solomon 5:15), the strongest members (Psalms 147:10).
Grinders - the molar teeth.
Cease - are idle.
Because they are few - and therefore not sufficient for masticating the food aright.
The windows - the eyes, the powers of vision, looking out from beneath the eyelids, which open and shut like the casement of a window.