The Greek is ‘fixing his gaze on them’. This is something that must sink in and he says it with the utmost solemnity.
Let us apply this also to Christians. Now you are saved. Maybe when you were saved you were poor but now you have got a good job and a good income. Are you safe? No, now that you have acquired some substance and some wealth – and most of us have; these are materialistic and wealthy days – they can take away your trust in God, they can take away your obedience to him. They can make you proud and rob you of humility. They can ruin your prayers and your love for Christ because things begin to matter too much and we go back to the gods of worldly achievement. Every unnecessarily expensive purchase in the life of a Christian is a great victory of the devil. It is a terrible thing when things become idols. We must have things that are better than we really need. We leave off living humbly and simply. Yes, all things are ours richly to enjoy, but they can ensnare us again. If God gives you wealth, never surrender your simplicity. Never surrender your self-control. Never give up generosity. If you are to be trusted with means and riches, well, you need great grace that you will deploy these things without them ruling you and ruining you.
Why did God not work on this occasion? We cannot answer that question because the secret things of God are hidden from us, but we can say that this man is an exhibition of how far human endeavour can come and yet still fall short of true conversion. How we need to call on the name of the Lord to save us!