1 John 2:9-11
 Whoever says he is in the light and
hates his brother is still in darkness.  Whoever loves his brother abides
in the light, and in him there is no cause for stumbling.  But whoever
hates his brother is in the darkness and walks in the darkness, and does not
know where he is going, because the darkness has blinded his eyes.
How the Light Shines in Christians’ Love
Verses 9–11 apply the test of the
love commandment in two cases
1) a person who loves
2) a person who hates.
Basically, what the book of 1 John is
getting at is, do you just know facts about Jesus or do you really have an intimate relationship with
Hate is the evidence of blindness to the
light of God.
Love is the evidence that sight has been given to the blind