Baal HaSulam, “Peace in the World”: And each and every individual in society is like a wheel that is linked to several other wheels placed in a machine. And this single wheel has no freedom of movement in and of itself, but continues with the motion of the rest of the wheels in a certain direction to qualify the machine to perform its general role.
Suppose you are a bolt in an engine and you break down. As a result the whole engine breaks down together with you. So the car and the passengers inside are unable to move, blocking the road for other cars with other passengers. All this is only because of one small bolt. There was such an incident in the English army, when the king lost a battle because of a horseshoe that broke off the horse. The horse began to limp and this demoralized the soldiers and led to their defeat. Later they found out that one broken nail was the reason for their defeat and for the death of thousands.
So what is the price of one single bolt? It is worth all the damage that it can cause if it breaks down or doesn’t function properly. It turns out that you are worthwhile to the world according to your value, because we suffer because of you. However, if you do your job, then we will reach the end of correction. This means that you are dear to us, actually priceless, since everything depends on you. In other words everyone is worth a whole world, both according to his contribution and according to the damage he can cause.
From the 4th part of the Daily Kabbalah Lesson 9/10/12, “Peace in the World”