Cada uno da lo que recibe
y luego recibe lo que da.
Nada es más simple,
no hay otra norma:
Nada se pierde,
todo se transforma.
- Jorge Drexler
Could be translated as (pardon my french):
Everyone gives what he gets, and later on he gets what he gives. Nothing is more simple, there is no other way: nothing gets lost, everything transforms/regenerates.
(no link to T'NK just yet)