What does Hebrews 2:4 mean?

Prior verses warned that the consequences of "drifting" (Hebrews 2:1) from the truths God has given are dire. Both God's direct judgment as well as natural cause-and-effect will affect those who follow error (Hebrews 2:2). Since the stakes of Jesus' message are so high, we can't be lazy or casual about it and expect to avoid trouble.

In verse 3, the writer of Hebrews began to mention the supporting evidence for the gospel message. There, Jesus' direct testimony is offered along with the accounts of those who saw His ministry in person (Luke 1:1–4; 2 Peter 1:16). Here, the use of miracles and other supernatural events is used as further proof. The apostles were given the ability to verify their message via God's power (Acts 2:43; 2 Corinthians 12:12).

The reason for bringing up these proofs is to highlight how serious the problem of "drifting" really is. God has not been casual about demonstrating Himself to mankind (Romans 1:18–20; Psalm 19:1; Hebrews 1:1–2). His message is not obscure or disguised. It is not dependent on blind faith. And so, there are very few excuses we can make when we violate His will. As verse 3 pointed out, God punished those who disobey, and He has given us more than enough evidence. How can a person reject all that God has done, and shown, and then expect not to be judged accordingly?