Why is the concept of the last days important for Christians?

The notion of the last days is pivotal in Christian theology as it marks a significant phase in God's redemptive plan. This period, initiated by the outpouring of the Holy Spirit at Pentecost, signifies that God's ultimate revelation through His Son has occurred. The realization that we live in the last days cautions against the anticipation of new divine revelations; rather, it affirms that all necessary truth has been established in Christ, and the ongoing work of the Spirit continues within this context of fulfilled prophecy.