1 Corinthians 13:1

If I speak with the tongues of men and angels, but have not love (for others growing out of God’s love for me), then I become only a noisy gong or a clanging cymbal (just an annoying distraction). 

Paul, who did so much in spreading the Gospel of Jesus, says everything that he has done is nothing without love.  Walking in love towards others represents what Jesus died for here on earth.  People won’t believe our witness is authentic without the Love of God being expressed to others in how we act and what we say.