Hebrews 5:14

12 For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat.

13 For every one that useth milk is unskilful in the word of righteousness: for he is a babe.

But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.

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

Compare

BSB
But solid food is for the mature, who by constant use have trained their senses to distinguish good from evil.
KJV
But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.
WEB
But solid food is for those who are full grown, who by reason of use have their senses exercised to discern good and evil.
ASV
But solid food is for fullgrown men, [even] those who by reason of use have their senses exercised to discern good and evil.
DARBY
but solid food belongs to full-grown men, who, on account of habit, have their senses exercised for distinguishing both good and evil.
BLB
But solid food is for the mature, the ones by constant use having trained the senses for distinguishing both good and evil.
ÅB
men fast føde er for voksne, for dem som ved bruken har sine sanser oppøvd til å skille mellom godt og ondt.
OTB
Men fast føde er for de modne, som gjennom konstant praksis har trent seg til å skjelne godt fra ondt.
B1930
men fast føde er for voksne, for dem som ved bruken har sine sanser opøvd til å skille mellem godt og ondt.

Study notes (Tyndale)

Original text and word study

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