My pastor's exposition of 1 Corinthians 13:1-3 on Sunday was very insightful and brought conviction upon me regarding how zealous I can become for sharing the love of Christ and at the same time not apply it to my life in a personal way. I think anyone who is involved in evangelism in a consistent manner can benefit from this message.
It reminded me of the following video from Desiring God. Although the video was based on James 3, it contained similar reminders of one who is involved in Christian activity while leading a loveless life.