How do we know eternal security is a true doctrine?

Eternal security, also known as perseverance of the saints, asserts that those truly saved will never lose their salvation. This doctrine is reinforced by passages like John 10:28, which declares that Christ's sheep cannot be plucked from His hand. Furthermore, 2 Timothy 2:19 asserts that 'the foundation of God stands sure,' indicating God's unchanging promise of salvation. Understanding that genuine faith leads to eternal life provides assurance to believers that those truly called and chosen by God will remain steadfast, despite difficulties and trials that may tempt them to turn away.