*** w74 12/15 p. 751 Who Will See "the Sign of the Son of Man"? ***
But this planet or its entire population will never be destroyed by nuclear warfare, nor by any man-directed means. For, at earth’s darkest moment, "then the sign of the Son of man will appear in heaven, and then all the tribes of the earth will beat themselves in lamentation, and they will see the Son of man coming on the clouds of heaven with power and great glory."—Matt. 24:30.
This refers, not to the beginning of Christ’s pa·rou·si´a or invisible presence, but to his "coming" (Greek, er·kho´me·non) at the "great tribulation such as has not occurred since the world’s beginning until now, no, nor will occur again." When he comes "with the clouds, and every eye will see him" he will be invisible to fleshly eyes. (Rev. 1:7) "Clouds" would naturally hide anyone in them, the expression therefore symbolizing that the one "coming" is himself invisible. Not with fleshly eyes in a literal sense, but from observation of what the Son of man does at that time, everyone will see that what takes place is not from men, but from heaven. The "tribes of earth" who have been brought into conflict with God because of false religion and by the commercial, political organizations will "beat themselves in lamentation" as they see the Son of man’s superhuman power exercised against their armies and systems.
During Christ’s pa·rou·si´a, which precedes his "coming" to execute judgment, the message of the Kingdom and its establishment has been declared like a mighty trumpet blast in the direction of the "four winds"—in every direction—for the gathering of Jehovah’s anointed, spirit-begotten "chosen ones" into unity of worship. (Matt. 24:31) Also, others have heard and listened with a desire to serve God, and are serving along with the "chosen ones."