"An extreme optimist is a man who believes that humanity will probably survive even if it doesn't take his advice"

"The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails"

"I'm an optimist, but an optimist who carries a raincoat"

"An optimist is a person who sees a green light everywhere, while a pessimist sees only the red stoplight... the truly wise person is colorblind"

"An optimist may see a light where there is none, but why must the pessimist always run to blow it out?"

"A pessimist and an optimist, so much the worse; so much the better"

"I think I probably hoped for it a little bit, but I'm not an optimist. I'm a realist... or maybe even a pessimist"

"The man who is a pessimist before 48 knows too much; if he is an optimist after it, he knows too little"

"A pessimist? That's a person who has been intimately acquainted with an optimist"

"I have become my own version of an optimist. If I can't make it through one door, I'll go through another door - or I'll make a door. Something terrific will come no matter how dark the present"

"The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty"