Hebrews 1:1-3 (ESV)
1 Long ago, at many times and in many ways, God spoke to our fathers by the prophets,
2 but in these last days he has spoken to us by his Son, whom he appointed the heir of all things, through whom also he created the world.
3 He is the radiance of the glory of God and the exact imprint of his nature, and he upholds the universe by the word of his power. After making purification for sins, he sat down at the right hand of the Majesty on high,

“But in these last days he has spoken to us by His Son”

Jesus Christ is the primary message of the Father.

Revelation 19:10 (ESV)
10 Then I fell down at his feet to worship him, but he said to me, “You must not do that! I am a fellow servant with you and your brothers who hold to the testimony of Jesus. Worship God.” For the testimony of Jesus is the spirit of prophecy.

The Father speaks a person to the earth.
And that speaking is multi-dimensional in its message.

This passage mentions some of the messages spoken in and by the Son:
1. He is the appointed heir of all things.
2. He is the One through whom the creation of the world came.
3. He is the radiance of the Glory of God.
4. He is the exact imprint of the nature of God.
5. He upholds the universe by the word of His power.
6. He makes purification for sins.
7. He is seated at the right hand of majesty on high.