Psalm 44:20-21 KJV
If we have forgotten the name of our God, or stretched out our hands to a strange god;
 Shall not God search this out? for he knoweth the secrets of the heart.
GOD KNOWS MAN’S IMAGINATION
Deuteronomy 31:21 KJV
And it shall come to pass, when many evils and troubles are befallen them, that this song shall testify against them as a witness; for it shall not be forgotten out of the mouths of their seed: for I know their imagination which they go about, even now, before I have brought them into the land which I sware.
1 Chronicles 28:9 KJV
And thou, Solomon my son, know thou the God of thy father, and serve him with a perfect heart and with a willing mind: for the Lord searcheth all hearts, and understandeth all the imaginations of the thoughts: if thou seek him, he will be found of thee; but if thou forsake him, he will cast thee off for ever.
Proverbs 6:16-19 KJV
These six things doth the Lord hate: yea, seven are an abomination unto him:  A proud look, a lying tongue, and hands that shed innocent blood,  An heart that deviseth wicked imaginations, feet that be swift in running to mischief,  A false witness that speaketh lies, and he that soweth discord among brethren.
GOD KNOWS THE HEART OF ALL
1 Samuel 16:7 KJV
But the Lord said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for the Lord seeth not as man seeth; for man looketh on the outward appearance, but the Lord looketh on the heart.
1 Kings 8:39 KJV
Then hear thou in heaven thy dwelling place, and forgive, and do, and give to every man according to his ways, whose heart thou knowest; (for thou, even thou only, knowest the hearts of all the children of men;)
Luke 16:15 KJV
And he said unto them, Ye are they which justify yourselves before men; but God knoweth your hearts: for that which is highly esteemed among men is abomination in the sight of God.
Acts 1:23-26 KJV
And they appointed two, Joseph called Barsabas, who was surnamed Justus, and Matthias.  And they prayed, and said, Thou, Lord, which knowest the hearts of all men , shew whether of these two thou hast chosen,  That he may take part of this ministry and apostleship, from which Judas by transgression fell, that he might go to his own place.  And they gave forth their lots; and the lot fell upon Matthias; and he was numbered with the eleven apostles.
Acts 15:7-9 KJV
And when there had been much disputing, Peter rose up, and said unto them, Men and brethren, ye know how that a good while ago God made choice among us, that the Gentiles by my mouth should hear the word of the gospel, and believe.  And God, which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as he did unto us;  And put no difference between us and them, purifying their hearts by faith.
GOD KNOWS ALL THE WAYS OF MAN
Job 31:4 KJV
Doth not he see my ways, and count all my steps?
Psalm 1:6 KJV
For the Lord knoweth the way of the righteous: but the way of the ungodly shall perish.
Proverbs 5:21 KJV
For the ways of man are before the eyes of the Lord , and he pondereth all his goings.
Mark 7:18-23 KJV
And he saith unto them, Are ye so without understanding also? Do ye not perceive, that whatsoever thing from without entereth into the man, it cannot defile him;  Because it entereth not into his heart, but into the belly, and goeth out into the draught, purging all meats?  And he said, That which cometh out of the man, that defileth the man.  For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,  Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness:  All these evil things come from within, and defile the man.
Hebrews 4:12-13 KJV
For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.  Neither is there any creature that is not manifest in his sight: but all things are naked and opened unto the eyes of him with whom we have to do.
GOD KNOWS YOUR THOUGHTS
Psalm 94:7-11 KJV
Yet they say, The Lord shall not see, neither shall the God of Jacob regard it .  Understand, ye brutish among the people: and ye fools, when will ye be wise?  He that planted the ear, shall he not hear? he that formed the eye, shall he not see?  He that chastiseth the heathen, shall not he correct? he that teacheth man knowledge, shall not he know ?  The Lord knoweth the thoughts of man, that they are vanity.
GOD KNOWS THE SECRETS OF YOUR HEART
Psalm 44:21 KJV
Shall not God search this out? for he knoweth the secrets of the heart.
GOD KNOWS YOUR THOUGHTS FROM AFAR OFF AND EVERY WORD FROM YOUR TONGUE
Psalm 139:1-4 KJV
O Lord , thou hast searched me, and known me .  Thou knowest my downsitting and mine uprising, thou understandest my thought afar off.  Thou compassest my path and my lying down, and art acquainted with all my ways.  For there is not a word in my tongue, but , lo, O Lord , thou knowest it altogether.
GOD KNOWS THE DECIETFULNESS AND WICKEDNESS OF YOUR HEART
Jeremiah 17:9-10 KJV
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 23:23-24 NKJV
“Am I a God near at hand,” says the LORD, “And not a God afar off?  Can anyone hide himself in secret places, So I shall not see him?” says the LORD; “Do I not fill heaven and earth?” says the LORD.
THEREFORE GIVE YOUR HEART TO CHRIST
Proverbs 23:26 KJV
My son, give me thine heart, and let thine eyes observe my ways.