Zaphod Beablebrox

“Philosophy is a necessary activity because we, all of us, take a great number of things for granted, and many of these assumptions are of a philosophical character; we act on them in private life, in politics, in our work, and in every other sphere of our lives -- but while some of these assumptions are no doubt true, it is likely, that more are false and some are harmful. So the critical examination of our presuppositions -- which is a philosophical activity -- is morally as well as intellectually important.”
― Karl Popper

“Always remember that it is impossible to speak in such a way that you cannot be misunderstood: there will always be some who misunderstand you.”
― Karl Popper

“Of all people only those are at leisure who make time for philosophy, only those are really alive. For they not only keep a good watch over their own lifetimes, but they annex every age to theirs.”
― Seneca, On the Shortness of Life

“The first principle is that you must not fool yourself and you are the easiest person to fool.”
― Richard P. Feynman