Why do you have the thorn in your brother's eye behind you, but don't think of the beam in your own eye?

This sentence means to describe people who are sensitive to discovering other people's shortcomings. When he thinks he has discovered the shortcomings in other people's character or life, he will try to point them out enthusiastically.

This book should be written for Jewish Christians living in different places at that time, so as to show that Jesus is the Messiah they look forward to day and night, and thus encourage them to accept the salvation brought by Jesus Christ. To this end, Matthew quoted about 70 verses in the Old Testament, which is generally called "biblical evidence".

Extended data:

The general program of Matthew is: Christ, the Lord God, becomes the body, king and savior, and saves his people from sin through his death and resurrection.

Although all four gospels record the deeds of Jesus, the second book looks at his life and teaching from the perspective of Jesus as the messiah promised by God in the Old Testament. For this reason, this book often links the prophecies of the Old Testament with the life of Jesus, thus serving as a bridge between the Old Testament and the New Testament. And because Jesus is the Messiah, this book emphasizes his right to interpret God's law and the kingdom of heaven.

Baidu Encyclopedia-Matthew