The benefactors of mankind are those who grumble to the best purpose. Grumbling has raised man from the condition of the gorilla to that of the judge on the bench of justice.
The history of the world is nothing but the history of successful or unsuccessful grumbling; operating in great things as in small, inculcating through all of them the great moral, that it is not good for a man to be contented with evils that he can remove.
Who is the best captain of a ship? The grumbler and the man of discipline, who will have things as they ought to be, even though he lose every sailor serving under him by his severity.
Who is the best general? The grumbler who insists upon having everything in mathematical order, and who has not the smallest drop of the milk of human kindness about him, whenever it is a question of duty or efficiency.