How do we know God's promise to preserve us is true?

The truth of God's promise to preserve us blameless is rooted in His unchanging nature and faithfulness. As stated in 1 Thessalonians 5:24, 'Faithful is He that calleth you, who also will do it.' This shows that God's commitment to His promises does not depend on our performance but on His character. Additionally, in Ephesians 1:13-14, believers are assured that they are sealed with the Holy Spirit, which serves as the earnest or guarantee of their inheritance. Therefore, our confidence lies not in ourselves, but in God's fidelity to uphold His promises.