I have heard this silly analogy all the time in motivational speeches. The concept is the difference between contributing and being committed. You can contribute or you can commit. The difference is actually a vital consideration for success. Can you really be successful by just contributing?
If you look at your breakfast plate of eggs and bacon. The chicken contributed to your breakfast, the pig really committed. Just a silly way to explain the difference. Commitment means to throw all you have into the exercise. Contributing means that you are only in with a portion of your heart and mind – not going to work.