It is wonderful that the Lord has represented riches as thorns, for these prick, while those delight, and yet they are thorns, for they lacerate the mind by the prickings of their thoughts, and whenever they entice to see they draw blood, as if inflicting a wound. But there are two things which He joins to riches, cares and pleasures, for they oppress the mind by anxiety and unnerve it by luxuries, but they choke the seed, for they strangle the throat of the heart with vexatious thoughts, and while they let not a good desire enter the heart, they close up as it were the passage of the vital breath.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: ubi sup.