os desatais

Question

I'm stuck on a line of a poem in spanish. The line is "No se porque os desatais". Its a line from a poem by Saint Theresa of Avila: the whole stanza is:

O ñudo, que ansi juntais
Dos cosas tan desiguales!
No sé porque os desatais:
Pues atado, fuerza dais
A tener por bien los males.

I'm not sure how to read that line in the context of the others.

Answer 1

It seems to come from the verb "desatar" which means "to untie." The next line says "Pues atado..." so it does seem to fit the context.

Answer 2

Keeping the metaphor about the knots, "desatarse" means "to become untie/undone".