'Sound' in the Bible

“The eye is the lamp of the body; so if your eye is clear [spiritually perceptive], your whole body will be full of light [benefiting from God’s precepts].

Even so, every healthy tree bears good fruit, but the unhealthy tree bears bad fruit.

Then He said to the man, “Reach out your hand!” The man reached out and it was restored, as normal and healthy as the other.

“Either make the tree good and its fruit good, or make the tree bad and its fruit bad; for the tree is recognized and judged by its fruit.