'What is Good' in the Bible

a good man out of the good treasure of his heart produces what is good: and an evil man out of the evil treasure of his heart produces what is evil: for 'tis from the abundance of the heart, that the mouth speaketh.

such solid nourishment is only fit for such as are arriv'd at their full growth and strength, whose senses have been exercis'd in distinguishing what is good, and what is prejudicial.