During these trying times of criticism of Christianity, bearing witness and giving testimony is a source of encouragement to "lukewarm" Christians as also to the non believers. Sometimes our words keep ringing in their ears and at other times it is the case of "Do not give what is holy to dogs - they will only turn and attack you. Do not throw your pearls in front of pigs - they will only trample them underfoot." (Mt. 7 vs.6)
Jesus is referred to as "faithful witness" on account of his truthfulness and not being afraid of rejection. Being the son of a mere carpenter, he excelled in his knowledge and teachings in spite of being scorned at many a time.
When it comes to us giving witness most of us sit on the fence in fear of being ridiculed and offending people we love.