Heaven is reserved for believers because it is a gift from God, given by grace, and secured by Christ's sacrifice.
The certainty of heaven being reserved for believers is rooted in God's promise and the assurance found in scripture. In 1 Peter 1:4, it describes an 'inheritance incorruptible and undefiled,' which means this promise is untouchable and everlasting. This inheritance is not something we obtain through our merit but is given according to God’s own choosing and grace. Believers are assured that this inheritance is kept by the power of God, emphasizing that it cannot be lost or taken away. Peter reassures Christians that their names are written in this inheritance, guaranteeing their security in God's eternal plan.
Scripture References:
1 Peter 1:4, Ephesians 1:11-14
Commentary