In the ancient and Jewish churches, 'songs' were prophesies about the Lord, especially His coming in the world, subjugation of evil spirits, and liberation of the faithful from their assaults. 'Heavenly songs' are voiced affections or affections expressed and modified by sounds. As thoughts are expressed by conversation, so affections are expressed by songs. From the balance and flow of the variations, angels perceive the object of the affection.

(Reference: Conjugial Love 55)

2966. 'Four hundred shekels of silver' means the price of redemption, as has been shown above in 2959. But what the price of redemption is will now be stated. Redemption is attributable to the Lord alone, and so also is the price of redemption. Yet the latter may also be spoken of in reference to man's receptivity, though with him the price of redemption is determined by the measure of his receptivity. The price of redemption is the Lord's merit and righteousness acquired through the severest temptations by which He united the Human Essence to the Divine Essence, and the Divine Essence to the Human Essence, doing so by His own power. And through that uniting of them He has saved the human race, especially those who belong to the spiritual Church.

For the Lord's becoming righteousness through the severest temptations, see 1813, 2025-2027.

For the Lord's uniting of the Human Essence to the Divine Essence, and the Divine Essence to the Human Essence, 1725, 1729, 1733, 1737, 1813, 2083.

For His doing this by His own power, 1616, 1921, 2025, 2026, 2083, 2500, 2523, 2632.

And for His salvation of the human race, especially those who belong to the spiritual Church, through that uniting of both, 2661, 2716.

These are the factors meant by the price of redemption.

[2] As regards the consideration that this price may also be spoken of in reference to man's receptivity, though with him that price is determined by the measure of his receptivity, this may be seen from the truth that it is the Lord's Divine which constitutes the Church with man. For the Church does not hearken to anything except that which is the Lord's own. It is the good of love and charity, and the truth of faith, that constitute that which is called the Church. For it is well known that all good comes from the Lord and that all truth comes from the Lord. Good and truth that come from man are not good and truth. From this it is evident that the price of redemption is with man determined by the measure of his receptivity.

[3] Because among the Jews the Lord's redemption was rated so low as to be scarcely anything at all, it is therefore said in Zechariah,

I said to them, If it is good in your eyes, give me my wages; and if not, withhold them. And they weighed out my wages, thirty pieces of silver. And Jehovah said to me, Throw it to the potter, the magnificent price I was valued at among them. Zechariah 11:12-13.

And in Matthew,

They took the thirty pieces of silver, the price set on him whom they had bought from the children of Israel, and gave them for the potter's field, as the Lord commanded me. Matthew 27:9-10.

'Thirty' is that which is so little as to be scarcely anything, see 2276. Thus the meaning is that the Jews rated the Lord's merit and redemption as nothing, but among those who believed that all good and all truth came from the Lord, the price of redemption is meant by 'forty' and to a higher degree by 'four hundred'.