The only way to overcome evil is through love. The power of love is beyond human comprehension, and those with eyes describes a ring of fire surrounding people with love such that it becomes difficult for evil to penetrate. Remember the saying 'Love is God and God is Love'. This ring of fire grows thinner with less love. We are being urged to keep our love glowing, in this context I do not mean selfish love, but one that is deprived of any attachment or sentiment. True love is different from sex, it is accepting someone for who they are and trying your best for such a person.
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From @bestgift