There is not a single outward mark of courtesy that does not have a deep moral basis.
Johann Wolfgang von GoetheI hate all explanations; they who make them deceive either themselves or the other party,-generally both.
Johann Wolfgang von GoetheMan... knows only when he is satisfied and when he suffers, and only his sufferings and his satisfactions instruct him concerning himself, teach him what to seek and what to avoid. For the rest, man is a confused creature; he knows not whence he comes or whither he goes, he knows little of the world, and above all, he knows little of himself.
Johann Wolfgang von Goethe