There are many beautiful and wonderful things in this world and it is with our eyes that we admire them.
Going beyond admiration, a desire may arise to the possession of these things.
And the more we look at these things, the strong the desire will grow.
It may not just be things. It may be an attraction to another person, or it may be a drive for an achievement.
In the 1st reading, St. Paul says while others boast of their worldly achievements, he will boast of something quite different - he will boast of his own feebleness and nothingness.
In the eyes of the world, that is nothing to boast about. In fact that seems like foolishness.
But only with God given eyes will we be able to look at the things of heaven, where neither moth or woodworms can destroy and thieves cannot break in and steal.
May God give light to our eyes so that we can see what are the things that are eternal and with the grace of God set our hearts on that heavenly treasure.