[PW] Octavio Paz quote

[Andrew Reding]

This quotation attributed to Octavio Paz appears widely on the Internet, 
but never with a verifiable citation:

What sets worlds in motion is the interplay of differences, their 
attractions and repulsions. Life is plurality, death is uniformity. By 
suppressing differences and peculiarities, by eliminating different 
civilizations and cultures, progress weakens life and favors death. The 
ideal of a single civilization for everyone, implicit in the cult of 
progress and technique, impoverishes and mutilates us. Every view of the 
world that becomes extinct, every culture that disappears, diminishes a 
possibility of life.  (Octavio Paz, Mexican Nobel Prize winner in 
Literature, 1990)

Some websites say it is from The Labyrinth of Solitude, but I have read 
carefully through that book and am quite sure it is NOT there.

I have also found a Spanish-language version, but it is similar in never 
having a verifiable citation:

Lo que mueve a los mundos
es la interacción de las diferencias,
sus atracciones y rechazos.
La vida es pluralidad.
La muerte es uniformidad.
Al reprimir diferencias y peculiaridades,
al eliminar diferentes culturas y civilizaciones
el progreso debilita la vida y fortalece la muerte,
nos empobrece y mutila.
Cada visión del mundo que se extingue,
cada cultura que desaparece
disminuye la posibilidad de vida.

Can anyone help find a VERIFIABLE citation in either English or Spanish?

Thanks,

Andrew Reding