“Blessed are the pure in heart: for they shall see God.”
Matthew 5:8 KJV
Pure in the Greek katharos: originally it means clean, used of soiled clothes which have been washed clean. Another meaning is that of corn cleansed of all chaff, and it is used of an army which has been purged of all discontented, cowardly, unwilling and insufficient soldiers, which is a force composed solely of first-class fighting men
Another meaning when in the company of another Greek word aerators it then means no tinge of alloy.
Put this all together the word katharos is unmixed, unadulterated, analloyed.
Blessed is the man whose motives are always entirely unmixed, for that man shall see God.
How is this possible because we are told the “The heart is deceitful above all things, and desperately wicked: who can know it?
I the Lord search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings.”
Jeremiah 17:9-10 KJV
We are given a stern warning to keep our heart;
“Keep thy heart with all diligence; for out of it are the issues of life.”
Proverbs 4:23 KJV
“This people draweth nigh unto me with their mouth, and honoureth me with their lips; but their heart is far from me.”
Matthew 15:8 KJV
“Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.
But those things which proceed out of the mouth come forth from the heart; and they defile the man. For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies: These are the things which defile a man: but to eat with unwashen hands defileth not a man.”
Matthew 15:11, 18-20 KJV
Ways to keep the heart pure.
“Circumcise therefore the foreskin of your heart, and be no more stiffnecked.”
Deuteronomy 10:16 KJV
“And the Lord thy God will circumcise thine heart, and the heart of thy seed, to love the Lord thy God with all thine heart, and with all thy soul, that thou mayest live.”
Deuteronomy 30:6 KJV
“And shalt return unto the Lord thy God, and shalt obey his voice according to all that I command thee this day, thou and thy children, with all thine heart, and with all thy soul; That then the Lord thy God will turn thy captivity, and have compassion upon thee, and will return and gather thee from all the nations, whither the Lord thy God hath scattered thee.”
Deuteronomy 30:2-3 KJV
Key word return.
Remember the great command; “Hear, O Israel: The Lord our God is one Lord: And thou shalt love the Lord thy God with all thine heart, and with all thy soul, and with all thy might. And these words, which I command thee this day, shall be in thine heart: And thou shalt teach them diligently unto thy children, and shalt talk of them when thou sittest in thine house, and when thou walkest by the way, and when thou liest down, and when thou risest up.”
Deuteronomy 6:4-7 KJV
So how do we keep our heart?
“Wherewithal shall a young man cleanse his way? by taking heed thereto according to thy word. With my whole heart have I sought thee: O let me not wander from thy commandments. Thy word have I hid in mine heart, that I might not sin against thee.”
Psalms 119:9-11 KJV