The greatest of all reasons is Love.
Love for a soul, a soul that Jesus gave His life for. A soul that God cherishes with ALL His being.
We witness because in the life, death and resurrection of Jesus Christ is hope, health and abundant life.
We witness because a converted soul brings life into themselves and they become empowered to serve others from a foundation of love and peace. This change benefits everyone, touching the whole world.
We witness because it blesses and honors the Father , Son and Holy Spirit.
He endured the cross and gave His life, that others may benefit. Therefore, we witness and share about His sacrifice so others may also benefit from knowing Him.
As Jesus has given His life for us, we give the knowledge of our Savior through witnessing to others.