The yeast, whose mission it has been up till now to raise the dough, to enliven it, to vivify it, in order to complete its mission, which is also to turn this dough into bread, has to give up its life.
La levadura -- cuya misión ha sido  hasta ahora de subir la masa, de avivarla, de vivificarla para cumplir con su misión, que también es convertir  la masa en pan -- debe perder su vida.