If we have done a piece of work before, we can do it again faster and better. We can continue taking on the same assignment and after the hundredth time, we may complete it twice as fast.
Think then, if we train another person to do it, will that person not be able to arrive at the same achievement over time? We are freeing up more of our time to do other work and duties,
and on the whole, complete all our work in a much shorter time.