How do we know the doctrine of the Beatitudes is true?

The truth of the Beatitudes lies in their origin; they are teachings of Jesus Christ, the Son of God, who spoke with authority unlike that of religious scholars (Matthew 7:29). Throughout His sermon, He explicitly states 'I say unto you,' which underscores His divine authority to declare who is blessed. Furthermore, the Beatitudes reveal the character of God's kingdom and provide a radical perspective on what it means to be blessed, contradicting worldly viewpoints. As believers, we accept these teachings as the truth since they reflect God's nature and the work of the Holy Spirit in the lives of those He blesses.