While it's possible there is a lesser-known poem by Paz that fits your description, it's more likely you're thinking of a different poet or a poem that shares similar themes with Paz's work.
To help me understand what you're looking for, could you provide more details about the poem? For example:
* What is the first line of the poem?
* What are some of the main themes explored in the poem?
* Do you remember any specific words or phrases used in the poem?
* Do you have any other information about the poem's context?
With more information, I can help you identify the poem you're looking for or find a poem by Paz that might be relevant to your interests.