Hebrews 5:14 in the King James Version
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.
Context
13 For everyone who lives on milk is not experienced in the word of righteousness, for he is a baby.
14 But solid food is for those who are full grown, who by reason of use have their senses exercised to discern good and evil.