Proverbs 27:19

¹⁷ Iron sharpeneth iron; so a man sharpeneth the countenance of his friend.

¹⁸ Whoso keepeth the fig tree shall eat the fruit thereof: so he that waiteth on his master shall be honoured.

As in water face answereth to face, so the heart of man to man.

²⁰ Hell and destruction are never full; so the eyes of man are never satisfied.

²¹ As the fining pot for silver, and the furnace for gold; so is a man to his praise.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: As water reflects the face, so the heart reflects the true man.
KJV: As in water face answereth to face, so the heart of man to man.
WEB: Like water reflects a face, so a man’s heart reflects the man.
ASV: As in water face [answereth] to face, So the heart of man to man.
DARBY: As [in] water face [answereth] to face, so the heart of man to man.
BLB: As [in] the water the face [is] to the face, so the heart of the man [is] to the man.

ÅB: Slik som ansikt speiler seg mot ansikt i vannet, så finner det ene menneske sitt hjerte igjen hos det andre.
OTB: Som vann gjenspeiler ansiktet, slik gjenspeiler en persons hjerte personen.
B1930: Likesom ansikt speiler sig mot ansikt i vannet, så finner det ene menneske sitt hjerte igjen hos det andre.

James 1:22–25
But be ye doers of the word, and not hearers only, deceiving your own selves.
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Psalms 33:15
He fashioneth their hearts alike; he considereth all their works.
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Mark 7:21
For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,
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Genesis 6:5
And GOD saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.
Read in context