Well, I'm sitting at the computer living an illustration of 1 Corinthians 12:20-26:
So now there are many members, but one body. The eye cannot say to the hand, “I do not need you,” nor in turn can the head say to the foot, “I do not need you.” On the contrary, those members that seem to be weaker are essential, and those members we consider less honorable we clothe with greater honor, and our unpresentable members are clothed with dignity, but our presentable members do not need this. Instead, God has blended together the body, giving greater honor to the lesser member, so that there may be no division in the body, but the members may have mutual concern for one another. If one member suffers, everyone suffers with it. If a member is honored, all rejoice with it. (NET)
As I sit here, my left heel is immersed in ice water. Why? My left heel bone has a relatively tint spur that can irritate the Achilles tendon. when the irritation gets really bad - like 3 or 4 weeks ago - walking is really difficult, and every other step is really painful. The ice water acts as an anti-inflammatory, and I'm doing the soaking right now to keep the irritation under control.
So, a tiny bump on a small bone - a bump that shouldn't be there, but is - can make it difficult and really for a full-sized human to walk (and do all the things that require walking, standing and balance). Paul's illustration is so vividly apt! There is no insignificant member in the Body of Christ! And when one member doesn't//can't do its job the whole Body suffers and can't do what it needs to do as well as it should!