How do we know Jesus' promise of a prepared place is true?

In John 14:2, Jesus states, 'In my Father's house are many mansions; if it were not so, I would have told you.' His assurance is built on His identity as God and the faithfulness of His word. As sovereign grace theology teaches, God is immutable and never lies. This means that His promises regarding salvation and eternal dwelling with Him are secure. Jesus, having accomplished our redemption through His death and resurrection, guarantees our place in heaven by the authority of His finished work, demonstrating that our hope is not based on our merit but wholly on His grace.