It channels water. If you want water, just turn on the tap. The challenge for us as Christians is to stay hooked up to the source of love and turn on the tap. Let the love of God flow. This brings us to our final point.
Love is displayed by loving.
Another way of saying this is that the evidence of love is loving one another. For anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen. What John is saying is that true love is not manifested in words, it is shown by deeds. He gives us the illustration of someone claiming he loves God on the one hand and on the other hand, he hates his brother. He tells us this person is nothing but a liar.