God's Name Written on the Heart

God's Name Written on the Heart


And I will write upon him the name of my God . . . and I will write upon him my new name (Revelation 3:12).

Purpose of the Illustration

  1. To show that God knows and writes His name of ownership upon the hearts of His children.

  2. To point out that hearts without God have other names and things written on them.


  1. Several chemical beakers or large glasses.

  2. Two or three knives with different sized blades.

  3. Small pieces of thin steel cut in the shape of hearts.

  4. One or more candles.

  5. A toothpick or other flat-nosed object with which to write.

  6. An alcohol or Bunsen burner.


  1. A bottle of hydrochloric acid.

  2. A small quantity of paraffin.

Method of Procedure

  1. Light the candle, and let it burn until it begins to melt.

  2. Cover the blades of the knives with a coating of paraffin from the dripping candle; also cover the metal objects with the paraffin.

  3. If you use a Bunsen or alcohol burner, melt the paraffin in a container in which you can dip the knife blades and the other objects.

  4. Be sure that the metal objects and the blades are completely covered with paraffin.

  5. On one or more blades or objects write the word "God" in clear letters.

  6. On other blades or objects write such words as "sin," "money," "pleasure," etc.

  7. Be sure that when writing you cut through the the paraffin coating to the metal. Write as plainly as possible.

  8. Put the knives and the other objects in the beakers or glasses.

  9. Slowly pour hydrochloric acid into the beakers or glasses until all the writing is covered with the acid.

  10. Let stand for a while, and then take out of the acid bath.

  11. Wipe the paraffin from the objects.

Chemical Reactions

  1. The paraffin coating keeps the acid from the metal, except where you write the names.

  2. At these places, where the metal is uncovered, the acid eats into the metal and engraves or writes the names on the metal.


  1. Be sure that the paraffin coats completely tfye objects to be immersed in the acid bath.

  2. The engraving will appear as you write on the metal; hence be careful to cut through the paraffin uniformly and avoid ragged edges.

  3. This experiment must be practiced at home before you attempt it in public. Test the time required for the acid to engrave the writing on the metal, and then time your acid bath accordingly when you present the experiment.


As the Oriental shepherd named each sheep—begin to set out your equipment—and called them by name, so the Bible tells us that God knows His sheep, or those who are His children; and His sheep know their Master's voice. When God comes into our hearts, He does not leave us unmarked in this world.

Ask a boy to bring a knife to the platform. Hold up the knife. This is Sam's knife. It belongs to him, and he recognizes it as his own. Ask the boy, "Would you like to have your name engraved on your knife?" (You may use the boy's knife with the ones you have provided for the experiment, or you may ask boys in advance to furnish you with their knives for the experiment.)

Light your burner, or the candles, if you use these. Just as you boys own these knives, or you girls own your Bibles, so those who are God's children belong to Him.

How do you suppose God knows those who are His?

Well, I'll show you what the Bible means when it says that He will write His name upon our hearts. Coat the metal objects with paraffin. (You will be wise to use melted paraffin if you have a number of objects to be engraved.)

I am going to write the name of God upon this heart (or another piece of metal). Begin writing. See, from now on this carries His name on it. Let it represent your heart when God writes His name of ownership upon it. This takes place in conversion when we give ourselves wholly to Him.

God does not write His name upon hearts that are not His. We must give ourselves unreservedly before He will engrave His name upon our hearts.

Now, there are some people who do not want God's name written on their hearts. If you could look into some people's hearts what would you find written on them? I'm sure you would find money on some hearts. Well, let's write "money" on this knife blade. Write on another blade.

Suzanne went all out for pleasure; she lived for the crowds, and her time was spent in activities that thrilled her. So let's write a large P on her heart. Write on a heart-shaped object.

Some people live for fame, and refuse to reckon with God. Others live for their careers. Engrave large C's and F's on objects.

Which would you rather have written on your heart? Pleasure, sin, fame, career, money, or God?

Place the objects in the beakers or glasses. (The objects that are completely covered with the acid must be handled with tongs or tweezers, so that the speaker is protected from the acid.) As I place these knives and other things in the glass so must we give ourselves wholly over to God before He will write His name upon our hearts. This knife blade must be completely covered with acid. Hold up a particular knife. Thus if we are to be God's children, and have His name written upon our hearts, we must give ourselves completely to Him. This is called coming to the Lord. The promise is, "Him that cometh to me I will in no wise cast out" (John 6:37).  This is the promise, and the Master bids us come and have His name written on our hearts. We come by faith in His blood, believing on the name of the Lord Jesus Christ.

Pour the acid into the beaker holding the objects on which God's name is written. These are the ones on which the word ' "God" is written. (You can use knife-blades and objects of various sizes to represent the different types of people who come to the Lord.)

These other objects have other things written on their hearts.  They are not God's. Pour acid on these objects.

(Time the acid bath as determined by your practice experiments at home. Do not leave the objects in the acid too long.)

Now, I'll take this knife out of the acid. Lift it out and wipe the paraffin from the blade. Sure enough, here is the name "God" engraved on the steel. Take out other objects and wipe them clean.

And here's an object with "sin" written on it. All these represent people who didn't care for God and who went the way of the world. Such lives God cannot bless.

But if God's name is written on our hearts, as on this knife blade, we are His, the sheep of His own pasture. We know His voice, and we follow the guiding of the Holy Spirit, for we have given ourselves entirely over to Him.

In such a life there is fullness of joy. God invites every boy or girl to give his or her life to Him. He calls us to be converted, to have our sins forgiven. There is no time like now to accept the Lord. Paul says, "Now is the accepted time; behold, now is the day of salvation" (II Corinthians 6:2). Why not let Jesus come into your heart now, and write His name upon your life?

| More