He sealeth up the hand of every man; that all men may know his work.
In winter God stops man's out-of-doors activity.
Sealeth - closeth up (Job 9:7). Man's "hands" are then tied up.
His work - in antithesis to man's own work ("hand"), which at other times engages men so as to be liable to forget their dependence on Cod. Umbreit, more literally, translates, That all men whom He has made (literally, of His making) may be brought to acknowledgment; namely, may know and acknowledge themselves to have been made by Him, and, therefore, to be subject to His will and power.