Celebrity quotes on Facebook are ridiculous to begin with. We rarely change our political and philosophical stances based on news or studies, and we certainly aren't going to shift our world view because of what Brad Pitt had to say on a topic. Words of advice from the rich and famous are barely effective to begin with, but add in the fact that motivational celebrity quotes you see online are often made up or misattributed, and they begin to have only negative value. Bill Cosby never uttered the words of the quote above, he is not 83, and he is not (that) tired. We recommend you check out snopes.com before you give your favorite celebrity credit for saying any of the ridiculously dumb things that get passed around Facebook.