And Moses made a bronze serpent and set it on the standard; and it came about, that if a serpent bit any man, when he looked to the bronze serpent, he lived. Num 21:9
When I was in high school, we rarely took short car trips. As a result of the long interstate drives, there was a lot to look around at during the trip. I always looked at the overpasses to read the graffiti. For some reason, Missouri highways have always had a problem with that epidemic. Along the way, I would learn that "Eric loves Cindy 4EVR" or that "Central High Rules". Then as you drove, eventually there would be that God honoring graffiti "Jesus loves you" or "John 3:16". I remember at the time thinking that I was glad that someone wrote something about Jesus. But, is that really a communication of anything about Jesus? If you wrote something on an overpass, could you step back and say "Well, I've done my work for the kingdom. Thousands of people will see this"?
Some people read in Numbers 21 and think that God instructed Moses to make an idol. It was not, because it was not an item to be worshipped. It was simply the mode by which the people showed faith in God to heal them. It says that anyone who looked at it lived, so that would seem to imply that some still refused afterwards. Maybe they said "I'm not spending my last few moments of life looking at some dumb fake snake" (apparently they were all great rhymers...). For whatever reason, some didn't believe. Do you think Moses made the snake, and silently held it up? No! I'm sure he shouted to the people what they had to do in order to be spared from death. Otherwise, how would they have known. Jesus said in John 3:14, that His salvation would come by the same way. He would be lifted up (on the cross), and people would look at Him, and based on their decision of faith or foolishness, they would be saved or condemned. But, Jesus gave the message clearly, so that when He was on the cross, people knew what decision they should make.
Do you clearly share the gospel? Or do you find yourself more like a graffiti writer with vague references to the Bible and Jesus, in the hopes that a friend or family member might come to know Christ. Be as Moses and Christ Himself. Make the message clear, and truly seek to lead people to salvation. Not that you can save them, but you can share the life-changing message that only comes through Jesus. A great and inexpensive resource, is Billy Graham's gospel tract "Steps to Peace with God. I usually use the Bible to witness, but people who are unfamiliar with the Bible, benefit from the illustrations that are in that tract. You can get them through the bookstore at www.billygraham.org