The revelation of God’s plan to rescue humans from the guilt, power, and penalty of sin can be understood as a combination of gradual and simultaneous unfolding rather than strictly being described by the terms hastily, suddenly, or instantly.
Gradually: Throughout history, God has progressively revealed His plan through scripture, prophecy, and the life of Jesus Christ. From the Old Testament prophecies to the New Testament fulfillment in Christ, the understanding of salvation has developed over centuries.
Simultaneously: While the revelation may seem gradual in terms of historical context, many elements of God’s plan were simultaneously revealed and are interwoven. For example, the themes of redemption, sacrifice, and grace appear throughout the Bible as part of a cohesive narrative.
In summary, God’s revelation of the plan for human salvation is best understood as a gradual unfolding that also includes simultaneous elements of fulfillment in different contexts throughout scripture.