'The voice of blood,' as in Genesis 4:10, signifies violence to charity. There are several passages in the Word where the word 'voice' is used for accusation, and 'blood' is used for sins, particularly hatred. Whoever holds hatred towards his brother kills him in his heart, as the Lord teaches in Matthew 5:21-22 and elsewhere.

(Odkazy: Arcana Coelestia 375)

376. 'Blood ¹ calling out' means guilt. This follows from what is said above, for those who resort to violence are held guilty, as in David,

Evil will slay the wicked, and those who hate the righteous will beheld guilty. Psalms 34:21.

In Ezekiel,

You, the city, have become guilty through the blood you have shed. Ezekiel 22:4.

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