He has the mind of Christ, the Spirit of Christ, and walks and talks with his Lord, and loves to associate with those of the precious faith. Let us look to the Scriptures for the answer. However, one must not make certain verses contradict their setting, nor leave out scriptures that clearly teach us that we must continue faithful to the end, or we will lose our salvation. In this scripture we have several requisites if we want to claim the Father's keeping. The sheep hear His voice and follow Him in obedience.
Salvation is conditional.
A saved person is within the realm of the Father's protection. But if they wander away to the cold mountains bare, they are prey for the wolf and thief. Yes, His sheep are very secure as long as they abide in His love. He also prayed for those who would later believe on Him through their word, which also includes us in our present time. Even though one has repented the devil will continue to tempt him, trying to win him back to his old ways, or somehow lead him astray from the narrow way.