The heart, in biblical context, refers to the innermost part of us.
It is that part of us where thoughts, ideas, opinions, feelings, intentions, aspirations and desires lie.

It is where thoughts are cooked up before they eventually become action.

On the other hand, the body refers to the external part of us which is visible to all.

THE CENTRALITY OF THE HEART
As the popular saying goes: "THE MATTER OF THE HEART IS THE HEART OF THE MATTER". The intents of the heart are fundamental, foundational, contributory and instrumental.
They determine actions, behaviour, conduct, and undertakings.

Little wonder, our Lord Jesus asserted: 'For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false wiitness, blasphemies'[Matt.15:19].

From this verse of scripture, we understand that sin works INSIDE-OUT and not OUTSIDE-IN. Sin starts from within before it comes out.[Matt.5:28]. Therefore the make-up and disposition of the heart is pivotal and key.

Our Lord Jesus Christ trying to point out how instrumental the heart is, declared:
'A good man out of the good treasures of the heart bringeth forth good things and an evil man out of the evil treasures bringeth forth evil things'[Matt.12:35].

It takes a clean heart to live a holy life, It takes purity of heart to churn out good works.
-The proud in heart will surely be proud in actions.
-The filthy in heart will sooner or later become filthy and licentious in actions.
-The malice and bitterness in the heart, will definately bring about malicious actions(hostility).

The heart is not only fundamental, because it's make-up determines our actions, but chiefly because it's state determines our eternal destination(i.e the state of our heart determines whether we'll end up in heaven or hell).
"BLESSED ARE THE PURE IN HEART: FOR THEY SHALL SEE GOD(these are the words of our Lord Jesus Christ).[Matt.5:8].
"WHO SHALL ASCEND INTO THE HILL OF THE LORD? OR WHO SHALL STAND IN HIS HOLY PLACE? HE THAT HATH CLEAN HANDS AND A PURE HEART"[Psalm24:3].

THE SACREDNESS OF OUR BODY
"...the Most High dwelleth not in temples made with hands..."[Acts7:45].

"We are His workmanship(craft and handiwork)..."[Eph.2:10].

"...ye are God's building"[ICor.3:9].

"know ye not that your bodies are the members of Christ?..."[1Cor.6:15].

"What? Know ye not that your body is the temple of the HolyGhost which is in you...and ye are not your own...For ye are bought with a price..."[1Cor.6:19].

"And what agreement hath the temple of God with idols?[2Cor.6:16].

Our bodies are sacred, hallowed and holy. Our body is a peculiar asset that is owned by God Almighty. It is God's most treasured possession.

God called other creations into existence with the word of His mouth, but He had to take His time, went to the dust and put in some degree of effort in order to form your body, His temple.
He also breathed into that body, thus making it a living soul[Gen.2:7].

He created it for His habitation, a holy God definately needs a holy temple to reside in.
-but you pierce God's sacred temple.
- you bore holes into it.
-you change it's natural colour.
-you deface it with tattoos and paintings.
-you offer it unto fornication and adultery.
-you destroy and cut it's span with smoking and alcohol.
-you make it an instrument of lies and cheating.
-you destroy lives with it.
-you offer it unto idols.
-you expose it shamelessly to every Tom, Dick and Harry on the street, forgetting that it is sacred.
-you put on it what God said you shouldn't put on it.

Are we not desecrating and defiling the temple, the habitation of the Almighty with all these.
God is calling you today, saying:
'I BESEECH YOU THEREFORE, BRETHREN BY THE MERCIES OF GOD THAT YOU PRESENT YOUR BODIES A LIVING SACRIFICE, HOLY ACCEPTABLE TO GOD WHICH IS YOUR REASONABLE SERVICE"[Rom.12:1].
"FOR WE MUST ALL APPEAR BEFORE THE JUDGEMENT SEAT OF CHRIST: THAT EVERYONE MAY RECIEVE THE THINGS DONE IN HIS BODY, ACCORDING TO THAT HE HAS DONE, WHETHER IT BE GOOD OR BAD"[2Cor.5:10].

God is interested in both our hearts and our body[Pro.23:26, Rom.12:1].

Acknowledge your sins(including every filthy thought), repent of them, confess them, ask for forgiveness, believe in your heart that Jesus died and rose, thereby shedding His blood for the remission of your sins.
After that;
-Give your heart to God[entertain positive thoughts only, discard negative thoughts as they come].[Pro.23:26].
- Ask God in heartfelt prayers, to circumcise and create in you, a new heart.[Psalm51:10, Rom.3:29].
- Present and Consecrate your body to God, the rightful owner.

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So if I didn't finish reading this booklet, I can't comment abi?

Don't categorise, God created both of them with a great interest.
Pls graduate from that children's department

You should have read before commenting.
That's an indication of maturity as that would provide the basis for conclusion and deductions.