"Therewith bless we God, even the Father; and therewith curse we men, which are made after the similitude of God." (James 3:9)
Here inserted within a very sober condemnation of the misuse of our God-given privilege of speech, is what seems almost an incidental reference to the image of God in man. It is not a trivial reference, however, but very significant.
For one thing, it tells us that even though the image of God in man has been severely marred by sin, it is still there! That is, man is eternal just as God is eternal, and we will all continue to exist forever, either in the presence of God, or away from His presence. That "image" is not shared with the animals, even the higher animals. The latter do have a body, soul (in the sense of mind), and spirit (in the sense of breath), but they do not possess "the image of God" which was specially created in man alone after all the animals had been created (note Genesis 1:21 and 1:27).
Another implication is that the word "similitude" includes the meaning of a physical resemblance. While God in His full essence is omnipresent and therefore invisible to human eyes, it is still true that, when God became man, He took on an actual physical body. Furthermore, our Lord Jesus, God the Son, still is "that same Jesus" and therefore still in that body (note Acts 1:11; 1 John 3:2; etc.).
Since His incarnation and His work of salvation were planned by the triune God "before the foundation of the world" (1 Peter 1:20), man was apparently created in the image of that body that Christ had planned to take on when He would eventually become man.
That being the case, our bodies are even more sacred than otherwise we might have assumed, and it is indeed a serious matter to misuse the tongue or any other member of the body, which is made after the similitude of Christ. HMM