Note: Envy affects every part of one’s body, even to the inner most parts. Bitter envy is in direct response to those around us. It interacts with people we are envious of their success, performance, or gift. Yes, even spiritual gifts. Envy seeks its own success.
“A tranquil heart gives life to the flesh, but envy makes the bones rot.” Proverbs 14:30 (ESV)
Gills: “but envy the rottenness of the bones; a man that envies the happiness and prosperity of others, this preys upon his own spirits, and not only wastes his flesh, but weakens and consumes the stronger parts of his body, the bones;”
“Who is wise and understanding among you? Let him show by good conduct that his works are done in the meekness of wisdom. But if you have bitter envy and self-seeking in your hearts, do not boast and lie against the truth. This wisdom does not descend from above, but is earthly, sensual, demonic. For where envy and self-seeking exist, confusion and every evil thing are there.” James: 3:13-16 (NKJV)
Poole: (14) “…though it pretends to be zeal, yet is really no other than envy; and partly because it commonly proceeds from an embittered spirit and tends to the embittering it more.”