This verse, John 8:46, is a powerful and provocative statement by Jesus to the Jewish leaders who were questioning his authority and trying to discredit him. Let's break down its meaning:

"Which of you convicts me of sin?": This is Jesus directly challenging his accusers. He's asking them, "Can anyone here point to a sin I've committed? Can anyone prove that I've done anything wrong?" He's asserting his moral purity and righteousness.
"If I tell the truth, why do you not believe me?": This is the crux of the matter. Jesus claims to be speaking the truth, and he implies that the truth should be self-evident. The reason they don't believe him, he suggests, isn't because his message is false, but because they are unwilling to accept the truth.

Here's a deeper interpretation of the verse:

Implied Divinity: While not explicitly stating he's God, Jesus' claim to be without sin is a strong implication. In Jewish thought, only God is without sin.
Rejection of Jesus as Messiah: The Jewish leaders were looking for a different type of Messiah – a political and military leader to free them from Roman rule. Jesus' message of spiritual salvation and his claims about his relationship with God challenged their preconceived notions.
Spiritual Blindness: Jesus suggests that the leaders' inability to believe him is due to a spiritual blindness or hardness of heart. They are unwilling to see the truth because it challenges their own power, authority, and worldview.
Challenge to Authority: Jesus is undermining the authority of the Jewish leaders by asserting his own moral authority and claiming to speak the truth directly from God.

In summary, John 8:46 is Jesus' bold claim of innocence and truthfulness, coupled with a challenge to his listeners to explain their rejection of him. It highlights the conflict between Jesus' message and the preconceived notions of those who opposed him, implying that their unbelief stems not from a lack of evidence but from a spiritual unwillingness to accept the truth.