Why did Paul say that the Law arouses sinful passions?

Paul talks about the Law arousing sinful passions several times in the book of Romans. What did he mean by this?

Romans 7:5
For when we were controlled by the sinful nature,the sinful passions aroused by the law were at work in our bodies, so that we bore fruit for death.

Romans 7:8
But sin, seizing the opportunity afforded by the commandment, produced in me every kind of covetous desire.

Romans 7:9
Once I was alive apart from law; but when the commandment came, sin sprang to life and I died.

I had a hard time understanding this. Then the Lord brought to my mind the scene in the Garden of Eden. If God had not commanded Adam and Eve not to eat from the tree of the knowledge of good and evil, the fruit of that tree would not have had any particular appeal. It would just be an ordinary tree, just like all the other trees in the garden, and Adam and Even would not have had any particular desire to eat from it. I was thus surprised that when I referred to several bible commentaries one of them pointed to the same scene! The Lord works in mysterious and wonderful ways.

Here're more facts gleaned from the commentaries.

However, because a command was given not to eat from it, there immediately springs a desire to disobey, the forbidden fruit now seems appealing and sin sparng to life, and the covetous desire is born and it rages within us.

It's a psychological fact and our carnal nature that whatever is forbidden seems especially desirable. Our sinful nature wars against any limitations put on our freedoms. We spring into rebellion, with a zeal to disobey and to do the very thing we were told not to do.