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I Corinthians 12:12 (KJV) For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ.

13 For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.

14 For the body is not one member, but many.

15 If the foot shall say, Because I am not the hand, I am not of the body; is it therefore not of the body?

16 And if the ear shall say, Because I am not the eye, I am not of the body; is it therefore not of the body?

17 If the whole body were an eye, where were the hearing? If the whole were hearing, where were the smelling?

18 But now hath God set the members every one of them in the body, as it hath pleased him.

19 And if they were all one member, where were the body?

20 But now are they many members, yet but one body.

21 And the eye cannot say unto the hand, I have no need of thee: nor again the head to the feet, I have no need of you.

22 Nay, much more those members of the body, which seem to be more feeble, are necessary:

23 And those members of the body, which we think to be less honourable, upon these we bestow more abundant honour; and our uncomely parts have more abundant comeliness.

24 For our comely parts have no need: but God hath tempered the body together, having given more abundant honour to that part which lacked.

25 That there should be no schism in the body; but that the members should have the same care one for another.

26 And whether one member suffer, all the members suffer with it; or one member be honoured, all the members rejoice with it.

27 Now ye are the body of Christ, and members in particular.

In the human body, each part of the body operates to bring health to the rest of the body.

The heart pushes blood to circulate to bring nourishment and oxygen to the rest of the body.

The lungs operate to draw in oxygen that will be transported to the rest of the body because of the action of heart to circulate blood.

The little toe would be interested in the health of the heart, because it is only through the health of the heart that it can get the oxygen and nutrients it needs.

Paul likens the body of Christ to the human body.  The body parts recognize, if that sentient verb can be used to make a point, that it can only operate as it is supposed to operate.  A heart will always operate as the heart.  The liver will always operate as the liver.  And so forth….

The body works harmoniously.  When it does not, it is called  dis-ease, with the dis- prefix meaning “not”, it means not-ease.  The body is not at rest when it is ill.

Among mankind, with free will, there can be an attempt to try to be some other part of the body.  There can be an attempt to take the place of another part of the body.

In a healthy body, when a cell gets out of line and begins to grow abnormally, that is called cancer.  It is not a good thing for the cell, or the body.