Wisdom, worldly, is presented as a pervasive spirit—akin to what Germans call Zeitgeist, the "spirit of the times"—that influences peoples and philosophies far beyond the church, and behind which stands a powerful, malevolent spirit being seeking to dominate humanity and thwart God's plan. This worldly wisdom is contrasted sharply with the wisdom of God, which Paul identifies as Christ Himself—His life, death, and resurrection—offered as God's answer to both Jewish notions (to whom Christ was a stumbling block) and Greek philosophy (to whom Christ was foolishness). Regardless of outward respectability, learning, or age, the wisdom of the Jews and Greeks did not originate from God; taken to its extreme, it led even religious authorities to crucify Christ. No one entirely escapes this influence, including converted believers, as evidenced by the carnality, envying, strife, and division Paul rebukes in the Corinthian church—problems mirrored in the modern church's own fragmentation. This worldly wisdom is described as "corrupt from the root," meaning it was never good, though Satan mixes it with elements of truth to make it deceptive, coming "as an angel of light." False prophets—not limited to religious figures but appearing also in academia, business, and economics—invoke God's name yet preach "another Jesus" and "another gospel," producing a false faith that appeals to human nature rather than divine nature. Such teachings produce belief, and people act on what they believe, making it dangerous to expose oneself carelessly to these messages. A specific modern manifestation of worldly wisdom is identified as psychology and its "handmaiden," psychiatry, both rooted in materialism (the doctrine that only matter is real) and humanism (the belief that man can achieve fulfillment without God). Psychiatry is called a contradiction in terms—a "doctor of the spirit" practiced by those who deny the spirit exists. These disciplines have infiltrated education and religion alike, using tactics such as "change agents" to reshape thinking gradually, resulting in psychology now dominating even mainline Christianity, including institutions tied to the Worldwide Church of God's own history and leadership. The remedy lies in returning to the singular message of Christ, transmitted through the apostles and those He has sent forth, which alone produces saving faith and genuine discernment. Divisions within the church are shown to result from believing false messages rather than holding fast to this original gospel. Ultimately, the "day" is declaring the true character of believers, testing who has genuinely built on the true faith versus who has been swept along by the wisdom of men, with repentance and renewed reliance on God's Spirit necessary for restoration and unity.