How do we know the progress of the Gospel is true?

The parable of the mustard seed in Luke 13 demonstrates the progression of the Gospel, starting from a minuscule beginning to a vast reality. Historically, Christianity overcame fierce persecution and systemic opposition to flourish across continents. The evidence is found in the rapid establishment of churches and the conversion of nations—remarkably, despite the societal and political forces attempting to suppress it. The growth and final triumph of the Gospel affirm Jesus' promise about the kingdom: it would grow like a great tree, offering refuge and shelter, validating the truth of this divine proclamation throughout history.