Distinguish Quotes

By what criterion... can we distinguish among the numberless effects, that are also causes, and among the causes that may, for aught we can know, be also effects, - how can we distinguish which are the means and which are the ends?

I've learned, I think, to be able to distinguish between the necessary and the unnecessary as far as my limited outside time is concerned. Saying "no" politely is a necessity if one wants to lead any kind of stable life.

There are two kinds of terrorism. Rational terrorism such as Palestinian terrorism and apocalyptic terrorism like Sept. 11. You have to distinguish between the two.

It is common to distinguish necessaries, comforts, and luxuries; the first class including all things required to meet wants which must be satisfied, while the latter consist of things that meet wants of a less urgent character.