Belshazzar has had a long time to repent, but has hardened his heart. Evidently he hardly knows Daniel, who seems to have been sent into relative obscurity.
We see this today. There has always been atheism and unbelief. There has been opposition to the Bible, and to the gospel. But we have never seen so much open public scorn, even by high and well-placed people. We are not just thinking of the websites associated with people like Professor Richard Dawkins. You look at those websites and the comments, and you see the hatred and the scorn. It's everywhere now: public open scorn. Interestingly God acted most severely, not when it was ignorance, nor when it was indifference, nor even when it was pride and self-confidence. But when it became insolence then God acted, and that is significant for our times. Another indication that these are the end times is that we have reached the time of undisguised scorn and derision of God’s truth.
It would make a good study for today. In these days of gimmickry, when people want to use – even earnest Christian sometimes – all sorts of other things beside the word as though the word is not good enough. They say, the word can't attract attention; the word can't compel. You need drama or human intervention or various other things in your evangelism. But there is a lesson here: just the fingers, compelling attention, and then the word. That is all that is important.