My personal favorite was Lord Acton's '...absolute power corrupts absolutely', which I feel is especially important to remember, today. Good stuff if you're keen on inspiring aphorisms.
You should tell your friend that extenuating circumstances have always been used to justify the gradual stripping of our rights, such as World War Two being used to justify (and perhaps it could have been, at the time) the first significant implementation of an income tax, which was assured to be a temporary measure to deal with a threat. If you look at
http://www.usgovernmentrevenue.com and go back far enough (late 30s/early 40s), you'll notice that the federal government made more in excise taxes (tobacco/alcohol) than in income. Another favorite of mine was from a Rothschild: 'Permit me to issue and control the money of the nation and I care not who makes its laws'.
My personal opinion concerning Obama is one of worry in relation to his dealings with large corporations--as inefficient as taxing everyone and giving it to an elite class is, it has the side effect of reducing the importance of the individual citizen. Before, when industrialization made it a necessity for men to have liberty so that they could move into better paying industries and out of agriculture/serfdom (speaking of America as inheriting these European ideas) we finally got our liberties--so that we could be an efficiently moving economic unit to empower rising national governments. Now that the government has the power to tax, and redistribute to mega corporations, our liberties become more of a liability as time goes on.
If we're to be free in the coming century, it will be through vigilance, and not blind faith in our ideologies and statesmen. Something that I feel has been slipping drastically, and which is more keenly felt for those of us under 30. It's hard to reconcile support of the administration when one considers that its actions will gradually erode our significance and leverage to maintain the rights we value. If we truly value the principals of the Democratic Party--personal liberty and prosperity for all--we should endeavor to understand the full consequences of our short-sighted actions. Sure, the terrorists need stopping today, and the easiest way to do that would be to grant absolute power to the police--temporarily, of course.
Insight's a deep word and I did my best to convey what I believe to be my own. But aside from that, I believe our only hope is for the people to wake up, and I fear that will only be after they have lost everything.