Of the importance of Christian joy, he wrote: Our joy in Christ speaks a language that all hearts can understand, and is a testimony for Him, such as mere knowledge and utterance can never give. Preachers who pride themselves on their knowledge of the Bible can often be rigidly dogmatic, intimidating, aloof, or impatient with people. Some even use their God-given skills of communication and knowledge to control people and serve their own selfish ends, like Diotrephes who is mentioned in the Third