This article is adapted from a message on the AI-Renewal mailing list . Paul seems to give with one hand, and take away with the other. In the end, though, I think he is offering a balanced approach.
Parallelism is a characteristic typical of Hebrew poetry.
The writer states an idea, and then reinforces the idea by repetition, variation, or contrast. This is when the second line repeats the first in slightly different wording. The second line completes the thought started in the first by supplementing it. Thus, rather than introducing contradiction, parallelism provides additional information. Though not in poetic form, parallelism is also taking place in Pauls three passages on food.