From Divinity Course and General Collectanea by Mary Baker Eddy
Jesus bore our infirmities. He took every step of the way before us. He demonstrated the whole problem and left us the rule. We must expect to take all the steps ourselves, and I tell you this, not to pronounce sentence upon you, but that being forewarned, you may be forearmed. When passing through the belief of sin, sickness or death, are you going to make a reality of it, or are you going to pick up the serpent and have no fear; but know that the serpent once handled becomes a rod, a staff? If made a reality it becomes a stumbling block.