Therefore, brethren, be even more diligent to make your call and election sure, for if you do these things you will never stumble; for so an entrance will be supplied to you abundantly into the everlasting kingdom of our Lord and Savior Jesus Christ. (2 Peter 1:10–11, NKJV)
Peter urges Christians to be eager to insure the certainty of our calling and election. Clearly, there is something the Christian must do in order to verify his or her entrance into heaven (the everlasting kingdom). God has called us through the gospel into fellowship with His Son. He has chosen to save us in His Son. Christians are forgiven of past sins in Christ, but we must diligently mature in Christ or risk stumbling and becoming “useless” and “barren” (2 Pet. 1:5-9). No one stumbles into heaven.