The book The Measure of a Man is summary of lectures given at the at the 1958 Conference of Christian Education. Those that attended the event loved what Dr. King had to say so much that they asked him to create the book.
King starts by fundamentally defining what a man is. Man, in his analysis, is both physical and spiritual. Individuals must cultivate both natures. Deplores those that see man as merely an animal. In this camp he puts, naturalist, materialist, and Marxist. The other camp he considers fundamentally Greek. Plato believed the soul must liberate itself from the body to fully develop. Jesus said man could not live on bread alone. The biblical quote supports the idea that the physical (bread) is needed in conjunction with other elements.
An explanation of how man is inherently a sinner follows. Man having a dual nature can choose good or evil. He knows what is right and chooses to do evil in spite of this knowledge. Because man chooses evil, he loses some of the image of G-d. To redeem himself, he needs the grace of G-d.
Many theologians lose site of man being a sinner because they see man as naturally progressing to a higher state. Depth psychology tries to confuse the issue as a conflict between phobia and desire. Ultimately, there is little real evidence of either view. Man chooses to do wrong.
King also has an interesting take on Western Civilization. He sees Western Civilization as rooted in egalitarianism and humanitarianism. The current manifestations of colonialism, segregation, and oppression is a diversion from these values. The mission of King is to return Western Civilization to its values.
The factors of a great life are length, breadth, and height. By length, King means not a life with a long duration, but one in which a person reaches a multitude of goals. For a life of longevity one must have self-love and strive to perfect a craft. King’s definition of breadth is a concern for fellow man and actively moving to improve the lot of others. Height is the connection to G-d and spiritual development. If one of these elements are missing our life is headed for folly.
This book shows King wasn’t a Democrat, Republican, Marxist, or Capitalist, but a Christian. Christianity was the root of all Dr. King’s philosophy and action. Many internet commentaries attempt to downplay King’s Christianity or deny he was Christian. A small sample of his writing would prove otherwise.