I knew I had read this somewhere but couldn't find it for ages then happily found it again today.

"It is incumbent upon them who are in authority to exercise moderation in all things. Whatsoever passeth beyond the limits of moderation will cease to exert a beneficial influence. Consider for instance such things as liberty, civilization and the like. However much men of understanding may favorably regard them, they will, if carried to excess, exercise a pernicious influence...