If we know the love of God we can't help loving one another. Suppose a person is acting for his own benefit and it appears unpleasant to you. If we have God's love in your heart, we may think, 'I once reacted just like him, but I have been renewed by the grace of God.' Then we can't hate or condemn him since we know God cherishes the person in the same way He has cherished and loved us. The more we know the love of God, the more happily we can live loving and serving others.