How do we know God’s justification is true?

In the sermon, it is highlighted that self-justification is futile and cannot satisfy God. The lawyer in Luke 10 attempts to justify himself by asking, 'Who is my neighbor?' which reveals the natural tendency to downplay our moral obligations. The need for God's justification is evident because only Christ can provide the perfect righteousness required by God. This justification is affirmed through Scripture, particularly in Romans 3:24, where we are justified freely by His grace through the redemption that is in Christ Jesus.