Job 14:4

Job 14:4 How can a clean man come out of an
unclean person? There can be no one out of him.

This passage should be understood as a poetic and exaggerated way of describing the state of humanity which, by its choices, moves away from divine justice. The “impure” being here refers to one who voluntarily chooses to expose himself to evil and reject the way of God. It is not a
declaration of fatality or an affirmation of an inevitable
transmission of impurity from one generation to the next.

The prophet Ezekiel 18:19-20 supports this interpretation by stating:
“The soul that sinneth, it shall die.”

Each individual is responsible for his own actions. If a father is unjust but his son walks in righteousness, the latter will live.

This demonstrates that responsibility is individual and that impurity is not an inheritance but a consequence of personal choices.

Job 14:4, though strikingly worded, does not exclude the possibility of a man becoming pure. The Scriptures clearly show that God calls every person to purity and righteousness.

One who forsakes sin and follows God’s commandments can live in complete purity and without sin. This passage, emphasizes the necessity of willingly rejecting uncleaness in order to attain divine righteousness.
So Job here uses a form of poetic expression to describe the
difficulty of producing purity from a life marked by wrong
choices overwelmed and submerged in sinful style.

However, in light of the Scriptures, it is evident that man, through a
conscious decision to obey God, can walk in righteousness
and be fully accepted before Him.