You searched for: if only closed minds came with closed mouths (Engelska - Spanska)

if only closed loop recycling takes place: e*v = ev;
si solo se realiza reciclado en ciclo cerrado: e*v = ev.

people with closed minds have their heads in the sand, seemingly believing that they wallow in the truth and are safely hidden and protected from outside influence.
la gente con este tipo de mentalidad tiene sus cabezas enterradas en la arena, aparentemente creyendo que disfrutan de la verdad escondidas en su seguridad y protegidas de las influencias exteriores.

perhaps you wish to disregard some of what is revealed to you, and you may be stressed because of it, since they say, “if only a treasure was sent down to him, or an angel came with him.”
tú, quizás, omitirías parte de lo que se te ha revelado -y te angustias por ello- porque dicen: «¿por qué no se le ha enviado abajo un tesoro o le ha acompañado un ángel?»