One of the most grievous of the effects of sin is the deformation of the image of God reflected in the human mind, and there can be no recovering from sin which does not bring with it the correction of this deformation and the reflection in the soul of man of the whole glory of the Lord God Almighty.Inspiration and Authority of the Bible, Chapter 1
God created us for this: to live our lives in a way that makes him look more like the greatness and the beauty and the infinite worth that he really is. This is what it means to be created in the image of God.
though the divine glory is displayed in man's outward appearance, it cannot be doubted that the proper seat of the image is in the soul.Institutes, Book 1 Chapter 15
The very deed of murder, fights directly and disobediently against the eternal God, who is the life and salvation of the world. For murder destroys the very image of God, because man is created in the similitude and likeness of God. If a man were to purposely deface the image of the king or prince, set up by their commandment, he would be accused of committing treason. How great a danger is he in, then, who destroys a man — who is the reasonable, living, and very picture of God himself!
Whatever be man's past history and evolution, he has from the beginning been made in God's image, and bears the divine impress in all the lineaments of body and soul. His degradation cannot wholly obliterate his inherent nobility, and indeed his actual corruption bears witness to his possible holiness. Christianity and Ethics A Handbook of Christian Ethics
With respect to fishes, birds, and beasts we read that God created them after their kind, that is, on a typical form of their own. Man, however, was not so created and much less after the type of an inferior creature. With respect to him God said, "Let us make man in our image"... the creation of man stands out as something distinctive.Systematic Theology, 183
man was made in the image and likeness of God in respect to his mind, by which he excels irrational creatures; in his image, however, according to memory, intelligence, and love; in his likeness according to innocence and justice, which are naturally in the rational mind.The Sentences, Book 2, Dist 16, Ch3