Delicadeza translates to "delicacy" or "gentleness." It's a beautiful and somewhat less common word in song lyrics, making it stand out.
In the song, Julieta Venegas sings, "Mi alma se conduce con delicadeza a tu alrededor" (My soul conducts itself with delicacy around you). This line beautifully conveys a sense of tender care and caution in the presence of a loved one, highlighting the profound respect and gentle approach she feels.
"Eterno" is Julieta Venegas asking a moment to stop moving. It opens close and physical, with "Pon tu lengua bajo la mía" ["Put your tongue under mine"], before she admits what she's actually asking for: "Quiero que sea eterno eterno" ["I want it forever, forever"]. She even names the problem out loud, singing "Se muy bien las leyes que rigen" ["I know full well the laws that rule"] and "Todo lo que esta vivo cambia" ["Everything that's alive changes"]. She's not naive about it. She just doesn't care.
That's the whole song: wanting something she knows can't last, and asking for it anyway. "Sera demasiado pedir quizás pero lo hago igual" ["Maybe it's too much to ask, but I'm asking anyway"], she sings, and by the second verse she's back where she started, singing "Pon tu piel cerca de la mía" ["Put your skin next to mine"] instead of tongue. The chorus keeps landing on one image, "suspendido en el tiempo" ["suspended in time"], because that's really all she's asking for: not forever, exactly. Just this, paused.