How do we know that true faith requires a sincere heart?

In John 5:44, Jesus asks, 'How can you believe which receive honor one of another, and seek not the honor that comes of God only?' This statement reveals that true faith is deeply connected to the state of one's heart. It is not merely an intellectual assent or understanding that leads to faith, but a genuine desire to seek God’s glory. Those who prioritize the approval of others over that of God often find themselves entrenched in false religion, yielding no lasting results in their spiritual journey.