How do we know that the church will always have false professors?

In Matthew 13:24-30, Jesus shares the parable of the wheat and the tares, illustrating that while good seeds are sown in the field of the church, the enemy sows tares among them. This signifies that false professors will always exist alongside true believers, and the church on earth will not be devoid of such individuals. Paul, in his letter to Timothy, reassures him that it shouldn't cause distress when these false believers appear; rather, he should remain steadfast in the faith, knowing that God knows His own. This understanding not only prepares ministers to endure but also emphasizes the church's need for discernment.