The human body has many members, yet each one has a unique role to play. The health and welfare of the body depend on the proper functioning of each member.
12:5 That is how it is in the body of Christ. There is unity (one body), diversity (many), and interdependency (members of one another). Any gifts we have are not for selfish use or display but for the good of the body. No gift is self-sufficient and none is unnecessary. When we realize all this, we are thinking soberly (12:3).
MacDonald, W., & Farstad, A. (1997). Believer's Bible Commentary : Old and New Testaments (Ro 12:4–5). Nashville: Thomas Nelson.