You are the salt of the earth. But if the earth loses its saltiness, how can it be made salty again? It is no longer good for anything, except to be thrown out and trampled by men.
For if we are never given permission to innovate, then how can we be encouraged to grow? If we cannot teach what we learn to our peers, to our co-builders, then how can we claim to teach them to children, who are younger, and harder to reach?