1 John 5:16 What is a sin unto death?

16 If any man see his brother sin a sin which is not unto death, he shall ask, and he shall give him life for them that sin not unto death. There is a sin unto death: I do not say that he shall pray for it. -1 John 5:16-17King James Version (KJV)

According to the Ascended Master Beloved Saint Germain: "The Holy Ghost, or Holy Spirit, is the feeling side of Life-God-the Activity of Divine Love, or the Mother Expression of Deity. This is why the sin against the Holy Ghost is referred to as that which brings such great distress, because any discord in the feeling breaks the Law of Love, which is the Law of Balance, Harmony, and Perfection. The greatest crime in the Universe against the Law of Love is humanity's almost ceaseless sending forth of every kind of irritable and destructive feeling." ('Unveiled Mysteries' by Godfre Ray King p7-8)