If there was only verse that I wish that every Christian brother and sister knew and would pass on to others, it would be John 14:6.
The way to God. Nothing is more important than being right with God and having a relationship with Him.
Jesus Christ is not a good way, or even the best way to God. From the lips of Jesus, we find that He is the only way.
Tell the world that God loves them and has provided the way back to Him. This way is not a plan, or formula, but a Person---Jesus Christ.