Jesus uses the example of the days of Lot to illustrate how people were living their everyday lives, absorbed in routine activities such as eating, drinking, buying, selling, planting, and building. These actions symbolize the normalcy of life and how people can become engrossed in their daily routines, often neglecting their spiritual well-being. The reference to Lot's time serves as a cautionary tale about the suddenness of divine intervention and the importance of being spiritually alert and prepared for God's kingdom.
The lesson here is about awareness and readiness. Just as people in Lot's time were caught off guard by the sudden destruction of Sodom, so too can people today be unprepared for significant spiritual events if they are not attentive. Jesus encourages his followers to maintain a balance between engaging in life's necessary activities and nurturing their spiritual lives, ensuring they are ready for any divine call or change. This teaching is a call to live with a sense of urgency and purpose, always prioritizing one's relationship with God.